Cita APA (7th ed.)
Fleming, W., & Varberg, D. E. (1989). Precalculus mathematics: A problem-solving approach (2nd ed.). Prentice Hall.
Cita Chicago (17th ed.)
Fleming, Walter, i Dale E. Varberg. Precalculus Mathematics: A Problem-solving Approach. 2nd ed. Englewood Cliffs, N.J.: Prentice Hall, 1989.
Cita MLA (9th ed.)
Fleming, Walter, i Dale E. Varberg. Precalculus Mathematics: A Problem-solving Approach. 2nd ed. Prentice Hall, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.