Gaya APA

Perlick, W, W., Hermanson, R, H. (1981). Programmed learning aid for introduction to business (5th ed). Homewood, IL: Richard D. Irwin.

Gaya MLA

Perlick, Walter, W.., Hermanson, Roger, H.. "Programmed learning aid for introduction to business". 5th ed Homewood, IL: Richard D. Irwin, 1981. Text.