Gaya APA
Barbara Pannwitt, dkk. (1976).
Contemporary english .
New Jersey:
Silver Burdett Company.
Gaya Chicago
Barbara Pannwitt, dkk.
Contemporary english.
New Jersey:
Silver Burdett Company,
1976.
Text.
Gaya MLA
Barbara Pannwitt, dkk.
Contemporary english.
New Jersey:
Silver Burdett Company,
1976.
Text.
Gaya Turabian
Barbara Pannwitt, dkk.
Contemporary english.
New Jersey:
Silver Burdett Company,
1976.
Print.