Cita APA (7a ed.)

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.