APA

Metcalf C. L., Flint W. P. & Metcalf R. L. (1951). Destructive and useful insects. New York: McGraw-Hill.

Chicago

Metcalf C L, Flint W P and Metcalf Robert L. 1951. Destructive and useful insects. New York: McGraw-Hill.

Harvard

Metcalf C. L., Flint W. P. and Metcalf R. L. (1951). Destructive and useful insects. New York: McGraw-Hill.

MLA

Metcalf C L, Flint W P and Metcalf Robert L. Destructive and useful insects. New York: McGraw-Hill. 1951.