Gaya APA

Sukur, S, G., Krist., S. (2008). English for Real Communication : Student's Book 4 (Cet. 1.--). Jakarta: Grasindo.

Gaya MLA

Sukur, Silvester, Goridus., Krist., Sigit. "English for Real Communication : Student's Book 4". Cet. 1.-- Jakarta: Grasindo, 2008. Text.