APA

Wallace G. J., . (1955). An introduction to ornithology. New York: Macmillan.

Chicago

Wallace George John, . 1955. An introduction to ornithology. New York: Macmillan.

Harvard

Wallace G. J., . (1955). An introduction to ornithology. New York: Macmillan.

MLA

Wallace George John, . An introduction to ornithology. New York: Macmillan. 1955.