Etkin, W., & Gilbert, L. I. (1968). Metamorphosis: A problem in developmental biology. Appleton-Century-Crofts.
استشهاد بنمط شيكاغوEtkin, William, و Lawrence I. Gilbert. Metamorphosis: A Problem in Developmental Biology. New York: Appleton-Century-Crofts, 1968.
MLA استشهادEtkin, William, و Lawrence I. Gilbert. Metamorphosis: A Problem in Developmental Biology. Appleton-Century-Crofts, 1968.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.