Billstein, R., Libeskind, S., & Lott, J. W. (2007). Mat 156, Mat 157: A problem solving approach to mathematics for elementary school teachers (9th ed.). Pearson Custom Pub.
Citace podle Chicago (17th ed.)Billstein, Rick, Shlomo Libeskind, a Johnny W. Lott. Mat 156, Mat 157: A Problem Solving Approach to Mathematics for Elementary School Teachers. 9th ed. Boston, Mass: Pearson Custom Pub, 2007.
Citace podle MLA (9th ed.)Billstein, Rick, et al. Mat 156, Mat 157: A Problem Solving Approach to Mathematics for Elementary School Teachers. 9th ed. Pearson Custom Pub, 2007.
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