\documentclass[10 pt]{article}
\usepackage[T2A]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[english,greek,russian]{babel}
\languageattribute{greek}{polutoniko} %for accents
\usepackage{gfsporson} %for a particular Greek font
\thispagestyle{empty}
\begin{document}
\selectlanguage{greek}
\textporson{kt~hm'a te >es a>ie`i m~allon >`h >ag'wnisma >es t`o paraqr~hma >ako'uein x'ugkeitai.} \\
\selectlanguage{english}
\emph{This work was written not for the author to profit today but for the reader to keep forever.}\\
\hfill Thucydides, \emph{The Peloponnesian War}, I.22.4\\
\selectlanguage{russian}
И лучше выдумать не мог. \\
\selectlanguage{english}
\emph{And a better plan he couldn't find.}\\
\hfill Aleksandr S.\,Pushkin, \emph{Eugene Onegin}, I.4
\end{document}
