Cita APA (7th ed.)

Feltwell, J. (1993). The encyclopedia of butterflies. Prentice Hall General Reference.

Cita Chicago (17th ed.)

Feltwell, John. The Encyclopedia of Butterflies. New York: Prentice Hall General Reference, 1993.

Cita MLA (9th ed.)

Feltwell, John. The Encyclopedia of Butterflies. Prentice Hall General Reference, 1993.