School Mathematics Study Group & Beatty, L. (1962). Mathematics for the elementary school: Grade 4 (rev. ed.). Yale University Press.
Citace podle Chicago (17th ed.)School Mathematics Study Group a Leslie Beatty. Mathematics for the Elementary School: Grade 4. rev. ed. New Haven: Yale University Press, 1962.
Citace podle MLA (9th ed.)School Mathematics Study Group a Leslie Beatty. Mathematics for the Elementary School: Grade 4. rev. ed. Yale University Press, 1962.
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