Dyfyniad APA

DREW, C. J., LOGAN, D. R., & HARDMAN, M. L. (1986). Mental retardation: A life cycle approach .--Ed.3. A Bell and Hawell.

Dyfyniad Arddull Chicago

DREW, Clifford J., Donald R. LOGAN, and Michael L. HARDMAN. Mental Retardation: A Life Cycle Approach .--Ed.3. Columbus: A Bell and Hawell, 1986.

Dyfyniad MLA

DREW, Clifford J., et al. Mental Retardation: A Life Cycle Approach .--Ed.3. A Bell and Hawell, 1986.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.