Cita APA (7th ed.)

Crowson, R. A. (1970). Classification and Biology. Heinemann Educational Books Ltd..

Cita Chicago (17th ed.)

Crowson, R. A. Classification and Biology. London: Heinemann Educational Books Ltd., 1970.

Cita MLA (9th ed.)

Crowson, R. A. Classification and Biology. Heinemann Educational Books Ltd., 1970.