Gaya APA

p.rein, D. (1985). Grolier Advance English Course 6 . united states of america: [s.l].Grolier International. Inc.

Gaya MLA

p.rein, David. "Grolier Advance English Course 6". united states of america: [s.l].Grolier International. Inc, 1985. Koleksi Elektronik.