Gaya APA
CURTIS, Helena. (1968).
Biology .
New York:
Worth Publishers.
Gaya Chicago
CURTIS, Helena.
Biology.
New York:
Worth Publishers,
1968.
Teks.
Gaya MLA
CURTIS, Helena.
Biology.
New York:
Worth Publishers,
1968.
Teks.
Gaya Turabian
CURTIS, Helena.
Biology.
New York:
Worth Publishers,
1968.
Teks.