Gaya APA

Vyas, P., Sofrina, M. (2009). Mastering English: Kangaroo is My Coach (a book about present perfect progresive tense) . Jakarta, Indonesia: PT Elex Media Komputindo (Kelompok Gramedia).

Gaya MLA

Vyas, Preeta., Sofrina, Mariam. "Mastering English: Kangaroo is My Coach (a book about present perfect progresive tense)". Jakarta, Indonesia: PT Elex Media Komputindo (Kelompok Gramedia), 2009. Text.