Instructional Objectives Exchange. (1972). Math: Data relationships : graphs, ratios and proportions, statistics and probability, grades K-9 (Rev. ed.).
Cita Chicago Style (17a ed.)Instructional Objectives Exchange. Math: Data Relationships : Graphs, Ratios and Proportions, Statistics and Probability, Grades K-9. Rev. ed. Los Angeles, Calif, 1972.
Cita MLA (8a ed.)Instructional Objectives Exchange. Math: Data Relationships : Graphs, Ratios and Proportions, Statistics and Probability, Grades K-9. Rev. ed. 1972.
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