Kaplan, S. H. (1957). Regents exams and answers: Trigonometry (1a. ed.). Barron's educational series INC.
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Chicago-čujuhus (17. p.)
Kaplan, Stanley H. Regents Exams and Answers: Trigonometry. 1a. ed. New York: Barron's educational series INC, 1957.
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MLA-čujuhus (9. p.)
Kaplan, Stanley H. Regents Exams and Answers: Trigonometry. 1a. ed. Barron's educational series INC, 1957.
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