Dyfyniad APA

Clark, L. P. (1976). Introduction to surveys and interviews. Policy Study Associates.

Dyfyniad Arddull Chicago

Clark, Lawrence P. Introduction to Surveys and Interviews. Croton-on-Hudson, New York: Policy Study Associates, 1976.

Dyfyniad MLA

Clark, Lawrence P. Introduction to Surveys and Interviews. Policy Study Associates, 1976.

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