APA استشهاد

Otto, J. H., & Towle, A. (1973). Modern Biology. Richard and winston.

استشهاد بنمط شيكاغو

Otto, James H., و Alert Towle. Modern Biology. Holt: Richard and winston, 1973.

MLA استشهاد

Otto, James H., و Alert Towle. Modern Biology. Richard and winston, 1973.