Citazione Stile APA (7a Edizione)

FELTWELL, J. (1986). The natural history of butterflies. Facts on file pub.

Citazione stile Chigago Style (17a edizione)

FELTWELL, John. The Natural History of Butterflies. New York: Facts on file pub, 1986.

Citatione MLA (9a ed.)

FELTWELL, John. The Natural History of Butterflies. Facts on file pub, 1986.