APA Style

Sukur, S, G., Wulandari, R, S. (2017). Easy English Conversation at The Office . Grasindo: Grasindo.

MLA Style

Sukur, Silvester, Goridus., Wulandari, Ratih, Suci. "Easy English Conversation at The Office". Grasindo: Grasindo, 2017. Text.