Gaya APA
Allen, John L. (2000).
Environment 2000/2001 (Ed. 19).
America:
McGraw-Hill/Dushkin.
Gaya Chicago
Allen, John L.
Environment 2000/2001.
Ed. 19
America:
McGraw-Hill/Dushkin,
2000.
Text.
Gaya MLA
Allen, John L.
Environment 2000/2001.
Ed. 19
America:
McGraw-Hill/Dushkin,
2000.
Text.
Gaya Turabian
Allen, John L.
Environment 2000/2001.
Ed. 19
America:
McGraw-Hill/Dushkin,
2000.
Print.