Dyfyniad APA

National Institute of industrial psychology. (1927). Occupational Psychology. National Institute of industrial psychology.

Dyfyniad Arddull Chicago

National Institute of industrial psychology. Occupational Psychology. London: National Institute of industrial psychology, 1927.

Dyfyniad MLA

National Institute of industrial psychology. Occupational Psychology. National Institute of industrial psychology, 1927.

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