Billstein, R., Libeskind, S., & Lott, J. W. (1990). A problem solving approach to mathematics for elementary school teachers (4th ed.). Benjamin/Cummings.
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Chicago Style (17th ed.) Zitazioa
Billstein, Rick, Shlomo Libeskind, eta Johnny W. Lott. A Problem Solving Approach to Mathematics for Elementary School Teachers. 4th ed. Redwood City, Calif.: Benjamin/Cummings, 1990.
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MLA (9th ed.) Zitazioa
Billstein, Rick, et al. A Problem Solving Approach to Mathematics for Elementary School Teachers. 4th ed. Benjamin/Cummings, 1990.
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Kontuz: berrikusi erreferentzia hauek erabili aurretik.