Cita APA (7th ed.)
Bello, I., & Hopf, F. (2006). Intermediate algebra (2nd ed.). Brooks/Cole Pub. Co.; New York.
Cita Chicago (17th ed.)
Bello, Ignacio, i Fran Hopf. Intermediate Algebra. 2nd ed. Pacific Grove , McGraw Hill: Brooks/Cole Pub. Co.; New York, 2006.
Cita MLA (9th ed.)
Bello, Ignacio, i Fran Hopf. Intermediate Algebra. 2nd ed. Brooks/Cole Pub. Co.; New York, 2006.
Atenció: Aquestes cites poden no estar 100% correctes.