APA (7th ed.) Citation

Westling, D. L. (1986). Introduction to mental retardation. Prentice-Hall.

Chicago Style (17th ed.) Citation

Westling, David L. Introduction to Mental Retardation. Englewood Cliffs, N.J: Prentice-Hall, 1986.

MLA (9th ed.) Citation

Westling, David L. Introduction to Mental Retardation. Prentice-Hall, 1986.