Gaya APA
Watt, Kenneth E. F.. (1973).
Principles of Environmental Science (Cet. 1.--).
New York:
McGraw-Hill International Book.
Gaya Chicago
Watt, Kenneth E. F..
Principles of Environmental Science.
Cet. 1.--
New York:
McGraw-Hill International Book,
1973.
Text.
Gaya MLA
Watt, Kenneth E. F..
Principles of Environmental Science.
Cet. 1.--
New York:
McGraw-Hill International Book,
1973.
Text.
Gaya Turabian
Watt, Kenneth E. F..
Principles of Environmental Science.
Cet. 1.--
New York:
McGraw-Hill International Book,
1973.
Print.