Gaya APA
Ritchie, John W.. (1941).
Biology and Human Affairs .
New York:
World Book Company.
Gaya Chicago
Ritchie, John W..
Biology and Human Affairs.
New York:
World Book Company,
1941.
Teks.
Gaya MLA
Ritchie, John W..
Biology and Human Affairs.
New York:
World Book Company,
1941.
Teks.
Gaya Turabian
Ritchie, John W..
Biology and Human Affairs.
New York:
World Book Company,
1941.
Teks.