Cita APA (7th ed.)

Ruud, W. L., & Shell, T. L. (2007). College algebra. Worth Publishers.

Cita Chicago (17th ed.)

Ruud, Warren L., i Terry L. Shell. College Algebra. New York, N.Y: Worth Publishers, 2007.

Cita MLA (9th ed.)

Ruud, Warren L., i Terry L. Shell. College Algebra. Worth Publishers, 2007.