Hatfield, M. M., Bitter, G. G., & Edwards, N. T. (1993). Mathematics methods for the elementary and middle school (2nd ed.). Allyn and Bacon.
Chicago-viite (17. p.)Hatfield, Mary M., Gary G. Bitter, ja Nancy Tanner Edwards. Mathematics Methods for the Elementary and Middle School. 2nd ed. Boston: Allyn and Bacon, 1993.
MLA-viite (9. p.)Hatfield, Mary M., et al. Mathematics Methods for the Elementary and Middle School. 2nd ed. Allyn and Bacon, 1993.
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