Gaya APA

B.s, A., A.R, N. (2019). The pocket book of 16 tenses for beginner (Cet. 2). Yogyakarta: Cakrawala.

Gaya MLA

B.s, Alexander., A.R, Nina. "The pocket book of 16 tenses for beginner". Cet. 2 Yogyakarta: Cakrawala, 2019. Text.