Gaya APA
p.rein, D. (1985).
Grolier Advanced English Course 2 .
Unid States Of America:
[s.l].Grolier International. Inc.
Gaya MLA
p.rein, David.
"Grolier Advanced English Course 2".
Unid States Of America:
[s.l].Grolier International. Inc,
1985.
Koleksi Elektronik.