Cita APA (7th ed.)

Ellis, R., & Gulick, D. (1981). College algebra. Harcourt Brace Jovanovich.

Cita Chicago (17th ed.)

Ellis, Robert, i Denny Gulick. College Algebra. New York: Harcourt Brace Jovanovich, 1981.

Cita MLA (9th ed.)

Ellis, Robert, i Denny Gulick. College Algebra. Harcourt Brace Jovanovich, 1981.