Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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