Gaya APA
Main Problems in American History. (1971).
:
.
Gaya Chicago
Main Problems in American History.
ed. rev cet. 7.
:
,
1971.
Text.
Gaya MLA
Main Problems in American History.
ed. rev cet. 7.
:
,
1971.
Text.
Gaya Turabian
Main Problems in American History.
:
,
1971.
Print.