Gaya APA
Guth, Hans P.. (1981).
OUR World Today .
Lexington, Massachusetts:
D.C. Heath.
Gaya Chicago
Guth, Hans P..
OUR World Today.
Lexington, Massachusetts:
D.C. Heath,
1981.
Text.
Gaya MLA
Guth, Hans P..
OUR World Today.
Lexington, Massachusetts:
D.C. Heath,
1981.
Text.
Gaya Turabian
Guth, Hans P..
OUR World Today.
Lexington, Massachusetts:
D.C. Heath,
1981.
Print.