Gaya APA

rein, D, P. (1984). grolier intermediate english course 7 . the United States of America: [s.l].Grolier International. Inc.

Gaya MLA

rein, David, P.. "grolier intermediate english course 7". the United States of America: [s.l].Grolier International. Inc, 1984. Koleksi Elektronik.