Gaya APA
David.P.Rein, . (1985).
Grolier Advance English Course 7 .
united states of america:
[s.l].Grolier International. Inc.
Gaya MLA
David.P.Rein, .
"Grolier Advance English Course 7".
united states of america:
[s.l].Grolier International. Inc,
1985.
Koleksi Elektronik.