Cita APA (7a ed.)

Langer, J., & Killen, M. (1998). Piaget, evolution, and development. Lawrence Erlbaum.

Cita Chicago Style (17a ed.)

Langer, Jonas, y Melanie Killen. Piaget, Evolution, and Development. Mahwah, New Jersey [etc.]: Lawrence Erlbaum, 1998.

Cita MLA (9a ed.)

Langer, Jonas, y Melanie Killen. Piaget, Evolution, and Development. Lawrence Erlbaum, 1998.