APA
Wallace G. J., Mahan H. D. j. a., . (1975). An introduction to ornithology. New York: Macmillan.
Chicago
Wallace George John, Mahan Harold D jt author, . 1975. An introduction to ornithology. New York: Macmillan.
Harvard
Wallace G. J., Mahan H. D. j. a., . (1975). An introduction to ornithology. New York: Macmillan.
MLA
Wallace George John, Mahan Harold D jt author, . An introduction to ornithology. New York: Macmillan. 1975.