Gaya APA
Ecological Principles and anvironmental issues. ().
Malang:
Prentice Hall.
Gaya Chicago
Ecological Principles and anvironmental issues.
.
Malang:
Prentice Hall,
.
Text.
Gaya MLA
Ecological Principles and anvironmental issues.
.
Malang:
Prentice Hall,
.
Text.
Gaya Turabian
Ecological Principles and anvironmental issues.
Malang:
Prentice Hall,
.
Print.