- Libro electrónicoNumbers and Operations WorkbookMel Friedman
- Libro electrónicoAlgebra & Functions WorkbookMel Friedman
- Libro electrónicoPraxis II Middle School Mathematics (0069) 2nd Ed.Mel Friedman
- Libro electrónicoCLEP® Calculus Book + OnlineGregory Hill
- Libro electrónicoGeometry WorkbookMel Friedman
- Libro electrónicoProbability and Statistics WorkbookMel Friedman
- Libro electrónicoAlgebra and Functions WorkbookMel Friedman
- Libro electrónicoNumbers and Operations WorkbookMel Friedman
- Libro electrónicoTrigonometry WorkbookMel Friedman
- Libro electrónicoProbability & Statistics WorkbookMel Friedman