Cita APA (7a ed.)

Haskel, S., & Sygoda, D. (1977). Contemporary Biology. Amsco School Publications, Inc.

Cita Chicago Style (17a ed.)

Haskel, Sebastian, y David Sygoda. Contemporary Biology. New York, NY: Amsco School Publications, Inc, 1977.

Cita MLA (9a ed.)

Haskel, Sebastian, y David Sygoda. Contemporary Biology. Amsco School Publications, Inc, 1977.