Waldroop, J. (2000). The 12 Bad Habits. Doubleday.
Chicago Style aipamenaWaldroop, James. The 12 Bad Habits. New York: Doubleday, 2000.
MLA aipamenaWaldroop, James. The 12 Bad Habits. Doubleday, 2000.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.