minimal org-ref example

foo.bib

@article{greenwade93,
    author  = "George D. Greenwade",
    title   = "The {C}omprehensive {T}ex {A}rchive {N}etwork ({CTAN})",
    year    = "1993",
    journal = "TUGBoat",
    volume  = "14",
    number  = "3",
    pages   = "342--351"
}

foo.org

foo

Hello.cite:greenwade93

References

bibliographystyle:plain bibliography:foo.bib

foo.tex

% Created 2016-11-21 Mon 10:09
% Intended LaTeX compiler: pdflatex
\documentclass[11pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{graphicx}
\usepackage{grffile}
\usepackage{longtable}
\usepackage{wrapfig}
\usepackage{rotating}
\usepackage[normalem]{ulem}
\usepackage{amsmath}
\usepackage{textcomp}
\usepackage{amssymb}
\usepackage{capt-of}
\usepackage{hyperref}
\date{\today}
\title{foo}
\hypersetup{
 pdfauthor={},
 pdftitle={foo},
 pdfkeywords={},
 pdfsubject={},
 pdfcreator={Emacs 25.1.1 (Org mode 9.0)}, 
 pdflang={English}}
\begin{document}

\maketitle
\tableofcontents

Hello.\cite{greenwade93}

\section{References}
\label{sec:org62f81a4}

\bibliographystyle{plain}
\bibliography{foo}
\end{document}