Describing and referencing exercises in latex

I would be like reference the exercises have done such that it says

Exercise 1 (Author [number], Chapter i, Exercise i.j )

\documentclass[a4paper, 11pt, notitlepage]{report}

\usepackage{amsfonts} % if you want blackboard bold symbols e.g. for real numbers
\usepackage{graphicx} % if you want to include jpeg or pdf pictures
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{float}
\newtheorem{thm}{Theorem}[section]
\newtheorem{lem}[thm]{Lemma}
\newtheorem{prop}[thm]{Proposition}
\newtheorem{cor}[thm]{Corollary}
\newtheorem{Def}[thm]{Definition}
\newtheorem{cond}[thm]{Condition}
\newtheorem{rem}[thm]{Remark}
\newtheorem{conj}[]{Conjecture}
\newtheorem*{post}{Postulate 1}
\newtheorem*{post2}{Postulate 2}
\newtheorem{ex}{Exercise}
\newtheorem{exa}[thm]{Example}

\title{BLANK} % change this
\author{BLANK} % change this
\date{\today} % change this

\numberwithin{equation}{section}

\newcommand{\mres}{\mathbin{\vrule height 1.6ex depth 0pt width
        0.13ex\vrule height 0.13ex depth 0pt width 1.3ex}}

\DeclareMathOperator{\proj}{proj}

\begin{document}
\end{document}