Gaya APA

Murphy, R. (1990). Essential grammar in use : a self-study reference and practice book for elementary students of English with answer (Cet. 1.). London: Cambridge University Press.

Gaya MLA

Murphy, Raymond. "Essential grammar in use : a self-study reference and practice book for elementary students of English with answer". Cet. 1. London: Cambridge University Press, 1990. Text.