Gaya APA
Contemporary America. (1955).
New York:
Harper & Row.
Gaya Chicago
Contemporary America.
3rd.ed..
New York:
Harper & Row,
1955.
.
Gaya MLA
Contemporary America.
3rd.ed..
New York:
Harper & Row,
1955.
.
Gaya Turabian
Contemporary America.
New York:
Harper & Row,
1955.
.