Gaya APA

Gallup, G, G, J, ;, A, M. (1986). The great American success story: factors that affect achievement . America: Dow Jones Irwin.

Gaya MLA

Gallup, George, Gallup,, Jr., ;, Alec, M.. "The great American success story: factors that affect achievement". America: Dow Jones Irwin, 1986. Text.