Dyfyniad APA

Leedy, P. D. (2015). Practical research: Planning and design. Harlow, Essex: Pearson Education.

Dyfyniad Arddull Chicago

Leedy, Paul D. Practical Research: Planning and Design. Harlow, Essex: Pearson Education, 2015.

Dyfyniad MLA

Leedy, Paul D. Practical Research: Planning and Design. Harlow, Essex: Pearson Education, 2015.

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