Raymond, M.(2001).Essential grammar in Use : A self-study reference and practice book for elementary students of English with answer. Second Edition / Raymond Murphy (Ed.ke-2).Jakarta:Erlangga.
Gaya MLA
Murphy, Raymond."Essential grammar in Use : A self-study reference and practice book for elementary students of English with answer. Second Edition / Raymond Murphy".Ed.ke-2Jakarta:Erlangga,2001.Skripsi.