APA (7th ed.) Citation

NetLibrary, Inc, Langer, J., & Killen, M. (1998). Piaget, evolution, and development. L. Erlbaum Associates.

Chicago Style (17th ed.) Citation

NetLibrary, Inc, Jonas Langer, and Melanie Killen. Piaget, Evolution, and Development. Mahwah, N.J.: L. Erlbaum Associates, 1998.

MLA (9th ed.) Citation

NetLibrary, Inc, et al. Piaget, Evolution, and Development. L. Erlbaum Associates, 1998.