Gaya APA
Perkins, Harvey L. (1980).
Guidelines For Development .
Singapore:
CCA.
Gaya Chicago
Perkins, Harvey L.
Guidelines For Development.
Singapore:
CCA,
1980.
Text.
Gaya MLA
Perkins, Harvey L.
Guidelines For Development.
Singapore:
CCA,
1980.
Text.
Gaya Turabian
Perkins, Harvey L.
Guidelines For Development.
Singapore:
CCA,
1980.
Print.