Gaya APA

Beveridge, D., Davidson, J, P. (1988). The Achievement challenge : how to be a 10 in business . Homewood, IL: Dow Jones-Irwin.

Gaya MLA

Beveridge, Don., Davidson, Jeffrey, P.. "The Achievement challenge : how to be a 10 in business". Homewood, IL: Dow Jones-Irwin, 1988. Text.