(1991). Cambridge proficiency examination practice 4 (Teacher's book). Cambridge, UK: Cambridge Univ. Press.
Trích dẫn kiểu ChicagoCambridge Proficiency Examination Practice 4 (Teacher's Book). Cambridge, UK: Cambridge Univ. Press, 1991.
MLA引文Cambridge Proficiency Examination Practice 4 (Teacher's Book). Cambridge, UK: Cambridge Univ. Press, 1991.
警告:这些引文格式不一定是100%准确.