Billstein, R., Libeskind, S., & Lott, J. W. (1997). A problem-solving approach to mathematics for elementary school teachers: Instructor's solutions manual (6th ed.). Addison-Wesley.
Lua i Stíl Chicago (17ú heag.)Billstein, Rick, Shlomo Libeskind, agus Johnny W. Lott. A Problem-solving Approach to Mathematics for Elementary School Teachers: Instructor's Solutions Manual. 6th ed. Reading, MA: Addison-Wesley, 1997.
Lua MLA (9ú heag.)Billstein, Rick, et al. A Problem-solving Approach to Mathematics for Elementary School Teachers: Instructor's Solutions Manual. 6th ed. Addison-Wesley, 1997.
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