Gaya APA
Grolier Programmed English Course Guide. (1986).
USA:
GROLIER Internasional.
Gaya Chicago
Grolier Programmed English Course Guide.
.
USA:
GROLIER Internasional,
1986.
Text.
Gaya MLA
Grolier Programmed English Course Guide.
.
USA:
GROLIER Internasional,
1986.
Text.
Gaya Turabian
Grolier Programmed English Course Guide.
USA:
GROLIER Internasional,
1986.
Print.