Earl, Boyd. Introduction to probability : a programmed unit in modern mathematics / [by] Boyd Earl and program editors J. William Moore [and] Wendell I. Smith. - New York : McGraw-Hill, c1963. - xii, 259 p.: ill .; 22 cm. Includes indexes. Subjects--Topical Terms: Probabilities.Probabilities--Programmed instruction. Dewey Class. No.: 519.2 / EAI 1963