Angel, A. R. (1992). Elementary algebra for college students (3rd ed.). Prentice hall.
Chicago-viite (17. p.)Angel, Allen R. Elementary Algebra for College Students. 3rd ed. New Jersey: Prentice hall, 1992.
MLA-viite (9. p.)Angel, Allen R. Elementary Algebra for College Students. 3rd ed. Prentice hall, 1992.
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