Gaya APA
Curtis, Helena. (1968).
Biology / Helena Curtis .
:
New York: Worth.
Gaya Chicago
Curtis, Helena.
Biology / Helena Curtis.
:
New York: Worth,
1968.
Buku.
Gaya MLA
Curtis, Helena.
Biology / Helena Curtis.
:
New York: Worth,
1968.
Buku.
Gaya Turabian
Curtis, Helena.
Biology / Helena Curtis.
:
New York: Worth,
1968.
Buku.