Cita APA (7a ed.)

Kreppner, K., & Lerner, R. M. (1989). Family systems and life-span development. Lawrence Erlbaum.

Cita Chicago Style (17a ed.)

Kreppner, Kurt, y Richard M. Lerner. Family Systems and Life-span Development. Hillsdale, New Jersey [etc.]: Lawrence Erlbaum, 1989.

Cita MLA (9a ed.)

Kreppner, Kurt, y Richard M. Lerner. Family Systems and Life-span Development. Lawrence Erlbaum, 1989.