Cicero, M. T. (1998). Letters to his friends. Cambridge: Harvard University Press.
Чикагска система за цитиранеCicero, Marcus Tullius. Letters to His Friends. Cambridge: Harvard University Press, 1998.
MLA формат за цитиранеCicero, Marcus Tullius. Letters to His Friends. Cambridge: Harvard University Press, 1998.
Внимание: Тези цитати може да не са 100% точни.