Cita APA (7a ed.)

Zigler, E., & Balla, D. A. (1982). Mental retardation: The developmental-difference controversy. Lawrence Erlbaum.

Cita Chicago Style (17a ed.)

Zigler, Edward, y David A. Balla. Mental Retardation: The Developmental-difference Controversy. Hillsdale, New Jersey [etc.]: Lawrence Erlbaum, 1982.

Cita MLA (9a ed.)

Zigler, Edward, y David A. Balla. Mental Retardation: The Developmental-difference Controversy. Lawrence Erlbaum, 1982.