Cita APA (7th ed.)
Angel, A. R. (1992). Elementary algebra for college students (3rd ed.). Prentice hall.
Cita Chicago (17th ed.)
Angel, Allen R. Elementary Algebra for College Students. 3rd ed. New Jersey: Prentice hall, 1992.
Cita MLA (9th ed.)
Angel, Allen R. Elementary Algebra for College Students. 3rd ed. Prentice hall, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.