\documentclass[12pt, a4paper, onecolumn, oneside, final]{report}
\usepackage[utf8]{inputenc}
%\usepackage{fontspec}
%\setmainfont{Times New Roman}
%%%%
\usepackage{tocbibind} %%% untuk memasukkan bibliography pada daftar isi
%
%%%%%% adding image %%%
\usepackage{graphicx}
\graphicspath{{images/}}
\newcommand{\pic}{Gambar}
%%%%
\usepackage{setspace} % pengaturan line spacing
%%%%%%
\usepackage[paper=a4paper,headheight=0pt,left=4cm,top=4cm,right=3cm,bottom=3cm]{geometry}
\usepackage[font=footnotesize,format=plain,labelfont=bf,up,textfont=up]{caption}
\captionsetup{labelsep=space}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{bm}
%%%%%
\usepackage{pslatex} % untuk menggunakan font times new roman
%%%%%%
\usepackage{fancyhdr}
%%%%%%% Pengaturan header dan footer dalam dokumen.
\fancyhf{}
\fancyhead[R]{\thepage}
\renewcommand{\headrulewidth}{0.0pt}
\pagestyle{fancy}
\setlength{\headheight}{14pt}
\addtolength{\topmargin}{-2pt}
%%%%%%%% pengaturan tabel dan gambar
\usepackage{float}
\floatplacement{figure}{H}
\floatplacement{table}{H}
%%%%%%%%
\usepackage{pdfpages} %% untuk memasukkan pdf pada dokumen
%%%%%%% Konfigurasi Daftar Pustaka
\usepackage{natbib}
\setcitestyle{citesep={;}, aysep={,}} % tambah semikolon dan koma di sitasi
\renewcommand\harvardyearleft{ \unskip } % remove parantheses di dapus
\renewcommand\harvardyearright[1]{.} % remove parantheses di dapus
%%%%%
\usepackage[bahasai]{babel} % Paket bahasa indonesia dan inggris
%%%%%%
%%%%%% konfigurasi setiap subbab
\usepackage{titlesec}
\titleformat{\section}
{\normalfont\fontsize{12}{12}\bfseries}
{\thesection}
{1em}
{}
\titleformat{\subsection}
{\normalfont\fontsize{12}{12}\bfseries}
{\thesubsection}
{1em}
{}
%%%%%%% Konfigurasi untuk tajuk bab %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\makeatletter
\def\@makechapterhead#1{%
%%%%\vspace*{50\p@}% %%% removed! % <----------------- Space from top of page to Chapter #
{\parindent \z@ \centering \normalfont
\ifnum \c@secnumdepth >\m@ne
\large\bfseries \MakeUppercase{\@chapapp}\space \thechapter % <--- uppercase
\par\nobreak
\vskip 5\p@ %<-------------- Space between Chapter # and title
\fi
\interlinepenalty\@M
\large \bfseries #1\par\nobreak
\vskip 30\p@
}}
%
\def\@makeschapterhead#1{% % format tulisan "daftar isi"
%%%%%\vspace*{50\p@}% %%% removed! % <----------------- Space from top of page to Chapter #
{\parindent \z@ \centering
\normalfont
\interlinepenalty\@M
\large\bfseries \MakeUppercase #1\par\nobreak
\vskip 30\p@
}}
\makeatother
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage{indentfirst} % Indentasi paragraf pertama
\setlength{\parindent}{1.2cm}
%%%%%%%%%%%%%%%%%%%%%%%%Paket untuk menggambar senyawa kimia%%%%
\usepackage{chemfig}
\usepackage[version=4]{mhchem}
\usepackage{chemnum}
\makeatletter
\def\Hv@scale{0.65}
\makeatother
\DeclareMathAlphabet{\foo}{OT1}{phv}{m}{n}
\renewcommand*\printatom[1]{\ensuremath{\foo{#1}}}
\makeatother
\setchemfig{double bond sep = 0.20700 em, % 'Bond Spacing'
fixed length = false, % 'Fixed Length'
bond offset = 0.18265 em, % 'Margin Width'
bond style={line width=0.50pt},
atom sep = 1.2 em}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage[hidelinks]{hyperref}
%%%%%Table of Contents typography%%%%%%%%%%%%%%%%%%%%%%
\usepackage[titles]{tocloft}
\newlength\mylength
\renewcommand\cftchappresnum{\chaptername~}
\settowidth\mylength{\cftchappresnum\cftchapaftersnum\quad}
\addtolength\cftchapnumwidth{2.3em}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%Paket untuk pengaturan tabel%%%%%%%%%%
\usepackage{booktabs}
\usepackage{multirow}
\usepackage{colortbl}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%Paket untuk penulisan Satuan Internasional%%%
\usepackage{siunitx}
\DeclareSIUnit{\Molar}{M}
\DeclareSIUnit{\calorie}{cal}
\DeclareSIUnit{\Calorie}{\kilo\calorie}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%-----KONTEN PENELITIAN-----%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}
\singlespacing
\input{front/judul}
\pagenumbering{roman} %Gunakan penomoran romawi
\setcounter{page}{1}
\singlespacing
\chapter*{LEMBAR PERSETUJUAN}
\input{chapters/Pengesahan}
\chapter*{ABSTRAK}
\input{chapters/abstrak}
\chapter*{ABSTRACT}
\input{chapters/abstract}
\singlespacing
\tableofcontents
\listoffigures
\listoftables
\clearpage
\pagenumbering{arabic} %Gunakan penomoran arab
\doublespacing
\renewcommand{\thechapter}{\Roman{chapter}}
\renewcommand{\thesection}{\arabic{chapter}.\arabic{section}}
\renewcommand{\thefigure}{\arabic{chapter}.\arabic{figure}}
\renewcommand{\thetable}{\arabic{chapter}.\arabic{table}}
\chapter{PENDAHULUAN}
\input{chapters/Bab-1-Pendahuluan}
\chapter{KAJIAN PUSTAKA, KERANGKA PEMIKIRAN DAN HIPOTESIS}
\input{chapters/Bab-2-Pustaka}
\chapter{METODOLOGI}
\input{chapters/Bab-3-Metodologi}
\chapter{HASIL DAN PEMBAHASAN}
\input{chapters/Bab-4-Hasil-dan-Pembahasan}
\chapter{KESIMPULAN DAN SARAN}
\input{chapters/Bab-5-Simpulan-dan-Saran}
%%%%%%%%%-----DAFTAR PUSTAKA-------%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\singlespacing
\bibliographystyle{mydcu-rev} %% modifikasi gaya sitasi dari dcu
\renewcommand{\bibname}{Daftar Pustaka} % ubah "bibliography" menjadi "Daftar Pustaka"
\bibliography{contoh_pustaka}
\end{document}