(1997). Letters. Oxford: Oxford University Press.
Trích dẫn kiểu ChicagoLetters. Oxford: Oxford University Press, 1997.
MLA引文Letters. Oxford: Oxford University Press, 1997.
警告：這些引文格式不一定是100％准確.
APA引文
(1997). Letters. Oxford: Oxford University Press.
Trích dẫn kiểu ChicagoLetters. Oxford: Oxford University Press, 1997.
MLA引文Letters. Oxford: Oxford University Press, 1997.