Power, J. (1968). How life begins: The exciting story of human and animal birth. Simon and Schuster.
Cita Chicago (17th ed.)Power, Jules. How Life Begins: The Exciting Story of Human and Animal Birth. New York: Simon and Schuster, 1968.
Cita MLA (9th ed.)Power, Jules. How Life Begins: The Exciting Story of Human and Animal Birth. Simon and Schuster, 1968.
Atenció: Aquestes cites poden no estar 100% correctes.