Trích dẫn APA

S.O. (1990). English grammar. London: University of Birmingham.

Trích dẫn kiểu Chicago

S.O. English Grammar. London: University of Birmingham, 1990.

MLA Trích dẫn

S.O. English Grammar. London: University of Birmingham, 1990.

Warning: These citations may not always be 100% accurate.