Gaya APA
Allen, John L.. (2000).
Environment 00/01 (19 th ed).
Connecticut:
Dushkin/McGraw-Hill.
Gaya Chicago
Allen, John L..
Environment 00/01.
19 th ed
Connecticut:
Dushkin/McGraw-Hill,
2000.
Text.
Gaya MLA
Allen, John L..
Environment 00/01.
19 th ed
Connecticut:
Dushkin/McGraw-Hill,
2000.
Text.
Gaya Turabian
Allen, John L..
Environment 00/01.
19 th ed
Connecticut:
Dushkin/McGraw-Hill,
2000.
Print.