APA引文

Foot, P., & Philippa Foot. (2003). Natural goodness. Oxford,New York: Clarendon,Oxford University Press.

Trích dẫn kiểu Chicago

Foot, Philippa, và Philippa Foot. Natural Goodness. Oxford,New York: Clarendon,Oxford University Press, 2003.

MLA引文

Foot, Philippa, và Philippa Foot. Natural Goodness. Oxford,New York: Clarendon,Oxford University Press, 2003.

警告：這些引文格式不一定是100％准確.