Gaya APA
Smith , Robert Leo. (1990).
Ecology and field biology .
New York:
Harper Collins Publisher .
Gaya Chicago
Smith , Robert Leo.
Ecology and field biology.
New York:
Harper Collins Publisher ,
1990.
Text.
Gaya MLA
Smith , Robert Leo.
Ecology and field biology.
New York:
Harper Collins Publisher ,
1990.
Text.
Gaya Turabian
Smith , Robert Leo.
Ecology and field biology.
New York:
Harper Collins Publisher ,
1990.
Print.