Gaya APA

Procter, S, E., et.all., C, T, H. (2001). Gogo Loves English 4 . Hongkong: Longman Asia ELT.

Gaya MLA

Procter, Stanton., Et.all.., et.all., Chan, Tak, Hung,. "Gogo Loves English 4". Hongkong: Longman Asia ELT, 2001. Text / Book.