Gaya APA

BIOLOGY. (1999). New York: [s.n.].

Gaya Chicago

BIOLOGY. 6. New York: [s.n.], 1999. Text.

Gaya MLA

BIOLOGY. 6. New York: [s.n.], 1999. Text.

Gaya Turabian

BIOLOGY. New York: [s.n.], 1999. Print.