Gaya APA

AJAM, A., USMAN, A. (2009). Practical english for ekoconomic students (Cetakan Pertama). Ternate: Lepkhair.

Gaya MLA

AJAM, Ajam., USMAN, Adurrahman. "Practical english for ekoconomic students". Cetakan Pertama Ternate: Lepkhair, 2009. Text.