Power, J. (1968). How life begins: The exciting story of human and animal birth. Simon and Schuster.
Chicago-viite (17. p.)Power, Jules. How Life Begins: The Exciting Story of Human and Animal Birth. New York: Simon and Schuster, 1968.
MLA-viite (9. p.)Power, Jules. How Life Begins: The Exciting Story of Human and Animal Birth. Simon and Schuster, 1968.
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