Gaya APA

Murphy,Raymond, . (1990). Essential grammar in use : a self-study reference and practice book for elementary students of english with answers (ed. 2). New York: Cambridge University Press.

Gaya MLA

Murphy,Raymond, . "Essential grammar in use : a self-study reference and practice book for elementary students of english with answers". ed. 2 New York: Cambridge University Press, 1990. Text.