Etkin, W., & Gilbert, L. I. (1968). Metamorphosis: A problem in developmental biology. Appleton-Century-Crofts.
Čikaški stil citiranjaEtkin, William, i Lawrence I. Gilbert. Metamorphosis: A Problem in Developmental Biology. New York: Appleton-Century-Crofts, 1968.
MLA način citiranjaEtkin, William, i Lawrence I. Gilbert. Metamorphosis: A Problem in Developmental Biology. Appleton-Century-Crofts, 1968.
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