APA
P.W. Choppins, . (1967). Virology. New York: Academic press.
Chicago
P.W. Choppins, . 1967. Virology. New York: Academic press.
Harvard
P.W. Choppins, . (1967). Virology. New York: Academic press.
MLA
P.W. Choppins, . Virology. New York: Academic press. 1967.