Gaya APA

murphy, R. (2001). Essential grammar in use : a self-study reference and practice book for elementary students of english : with answers (2nd ed. ). Jakarta: Erlangga.

Gaya MLA

murphy, Raymond. "Essential grammar in use : a self-study reference and practice book for elementary students of english : with answers". 2nd ed. Jakarta: Erlangga, 2001. Text.