Tex Bib Code

\usepackage{natbib}

% Packages
\usepackage[right=1.25in,left=1.25in,top=1.1in,bottom=1.1in]{geometry}
\usepackage{etoolbox}
\usepackage{booktabs}
\usepackage{authblk}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsthm}
\usepackage{mathtools}
\usepackage{mathrsfs}
\usepackage[hidelinks]{hyperref}
\usepackage{xcolor}
\usepackage{cases}
\usepackage{empheq}
\usepackage{enotez}
\usepackage{pdflscape}
\usepackage{natbib}
\usepackage{graphicx}
\usepackage{subcaption}
\usepackage{multirow} %% Necessary if we are doing tables in LaTeX
\usepackage{xr}

% optional

% Hypersetup for hyperlinks
\hypersetup{
    pdftitle={Your title here},
    pdfauthor={Your name here},
    pdfsubject={Your subject here},
    pdfkeywords={keyword1, keyword2},
    bookmarksnumbered=true,
    bookmarksopen=true,
    bookmarksopenlevel=1,
    colorlinks=true,
    pdfstartview=Fit,
    pdfpagemode=UseOutlines,    % This is the option you were looking for
    pdfpagelayout=TwoPageRight,
    linkcolor={red!50!black},
    citecolor={blue!50!black},
    urlcolor={blue!80!black}
}

% tikz and plots
\usepackage{tikz}
\usepackage{tikzscale}
\usetikzlibrary{arrows,calc, automata, patterns, positioning, shapes.geometric, decorations.pathreplacing,decorations.markings}
%add plot
\usepackage{pgfplots}
\usepgfplotslibrary{groupplots}
\pgfplotsset{width=10cm,compat=1.9}

% color scheme
\newcommand{\red}[1]{\textcolor{red}{#1}}
\newcommand{\blue}[1]{\textcolor{blue}{#1}}
\newcommand{\green}[1]{\textcolor{green}{#1}}
\newcommand{\teal}[1]{\textcolor{teal}{#1}}

% quick maths
\newtheorem{theorem}{Theorem}
\newtheorem{corollary}{Corollary}
\newtheorem{lemma}[theorem]{Lemma}
\newtheorem{ass}{Assumption}
\theoremstyle{definition}\newtheorem{remark}{Remark}

\theoremstyle{definition}\newtheorem{definition}{Definition}
\newtheorem{prop}{Proposition}
\newtheorem{notation}{Notation}
\theoremstyle{definition}\newtheorem{fact}{Fact}
\renewcommand\qedsymbol{$\blacksquare$}

\begin{document}
% content %

\newpage
\bibliographystyle{apalike}
\bibliography{references5.bib}

\end{document}