Cita APA (7a ed.)

Zigler, E., & Hodapp, R. M. (1995). Understanding mental retardation (4th repr. of the 1st ed. of 1986.). Cambridge university.

Cita Chicago Style (17a ed.)

Zigler, Edward, y Robert M. Hodapp. Understanding Mental Retardation. 4th repr. of the 1st ed. of 1986. Cambridge: Cambridge university, 1995.

Cita MLA (9a ed.)

Zigler, Edward, y Robert M. Hodapp. Understanding Mental Retardation. 4th repr. of the 1st ed. of 1986. Cambridge university, 1995.