Gaya APA

Gallup, G. et al (1986). the Great American success story : factors that affect achievment / George Gallup, Alec M. Gallup, with William Proctor . Homewood, Ill.: Dow Jones-Irwin.

Gaya MLA

Gallup, George. et al. "the Great American success story : factors that affect achievment / George Gallup, Alec M. Gallup, with William Proctor". Homewood, Ill.: Dow Jones-Irwin, 1986. Buku.