Troutman Andria P. Mathematics: a good beginning (Strategies for Teaching Children)/ Andria P. Troutman and Betty K. Lichtenberg - 4th ed. - Belmont, California: Wadsworth, 1991. - xix, 551 p.: ill. Includes index ISBN: 0534151442 Subjects--Topical Terms: Mathematics --Study and teaching (Elementary) LC Class. No.: QA135.5 TRO 1991