APA استشهاد

Petrson, R. T. (1963). birds. Time-Life Books.

استشهاد بنمط شيكاغو

Petrson, Roger Tory. Birds. New York: Time-Life Books, 1963.

MLA استشهاد

Petrson, Roger Tory. Birds. Time-Life Books, 1963.