Dyfyniad APA

Hiland, R. E., & Richardson, W. J. (1957). Work sampling. mc Graw Hill Book company.

Dyfyniad Arddull Chicago

Hiland, Robert E., and Wallance J. Richardson. Work Sampling. New york: mc Graw Hill Book company, 1957.

Dyfyniad MLA

Hiland, Robert E., and Wallance J. Richardson. Work Sampling. mc Graw Hill Book company, 1957.

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