Gaya APA
Krebs, Charles J.. (1999).
Ecological methodology (2nd ed).
California:
Longman.
Gaya Chicago
Krebs, Charles J..
Ecological methodology.
2nd ed
California:
Longman,
1999.
Text.
Gaya MLA
Krebs, Charles J..
Ecological methodology.
2nd ed
California:
Longman,
1999.
Text.
Gaya Turabian
Krebs, Charles J..
Ecological methodology.
2nd ed
California:
Longman,
1999.
Print.