APA-referens (7:e uppl.)

Belen, L. Q. (1991). The ultimate formula for success. [s.n.].

Chicago-referens (17:e uppl.)

Belen, Leonardo Q. The Ultimate Formula for Success. Manila: [s.n.], 1991.

MLA-referens (9:e uppl.)

Belen, Leonardo Q. The Ultimate Formula for Success. [s.n.], 1991.