Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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