Angel, A. R., & Semmler, R. (2000). Elementary algebra for college students: Student study guide (5th ed.). Prentice Hall.
Citazione stile Chigago Style (17a edizione)Angel, Allen R., e Richard Semmler. Elementary Algebra for College Students: Student Study Guide. 5th ed. Upper Saddle River, N.J: Prentice Hall, 2000.
Citatione MLA (9a ed.)Angel, Allen R., e Richard Semmler. Elementary Algebra for College Students: Student Study Guide. 5th ed. Prentice Hall, 2000.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.