APA

Feltwell J., . (1986). The natural history of butterflies. New York, N.Y: Facts on File Publications.

Chicago

Feltwell John, . 1986. The natural history of butterflies. New York, N.Y: Facts on File Publications.

Harvard

Feltwell J., . (1986). The natural history of butterflies. New York, N.Y: Facts on File Publications.

MLA

Feltwell John, . The natural history of butterflies. New York, N.Y: Facts on File Publications. 1986.