Gaya APA
Cohen, Saul B.. (1967).
Problems and Trends in American Geography (Cet.1).
USA:
Basic Books..
Gaya Chicago
Cohen, Saul B..
Problems and Trends in American Geography.
Cet.1
USA:
Basic Books.,
1967.
Text.
Gaya MLA
Cohen, Saul B..
Problems and Trends in American Geography.
Cet.1
USA:
Basic Books.,
1967.
Text.
Gaya Turabian
Cohen, Saul B..
Problems and Trends in American Geography.
Cet.1
USA:
Basic Books.,
1967.
Print.