Pikunas, J. (1976). Human development, an emergent science (3d ed.). McGraw-Hill.
Cita Chicago (17th ed.)Pikunas, Justin. Human Development, an Emergent Science. 3d ed. New York: McGraw-Hill, 1976.
Cita MLA (8th ed.)Pikunas, Justin. Human Development, an Emergent Science. 3d ed. McGraw-Hill, 1976.
Atenció: Aquestes cites poden no estar 100% correctes.