Mock, V. E. (1982). Fraction drill for levels 3-5. Pitman Learning.
Chicago Style aipamenaMock, Valerie E. Fraction Drill for Levels 3-5. Belmont, Calif: Pitman Learning, 1982.
MLA aipamenaMock, Valerie E. Fraction Drill for Levels 3-5. Pitman Learning, 1982.
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