Good Cooking at http://www.goodcooking.com/conversions/liq_dry.htm
Diana's Desserts at http://www.dianasdesserts.com/index.cfm/fuseaction/tools.measures/Measures.cfm
The National Institute of Standards and Technology (NIST) - The NIST Guide for the use of the International System of Units - Appendix B, subsections B.8 Factors for Units Listed Alphabetically and B.9 Factors for units listed by kind of quantity or field of science.
Lide, David R., Daniel (Editor-in-Chief). CRC Handbook of Chemistry and Physics, 89th Edition New York, NY: CRC Press, p. 1-28, 2008.
Wikipedia contributors. "Conversion of units" Wikipedia, The Free Encyclopedia. Wikipedia, The Free Encyclopedia, last visited 26 Jun. 2011.
Wikipedia contributors. "Cooking Weights and Measures" Wikipedia, The Free Encyclopedia. Wikipedia, The Free Encyclopedia, last visited 29 Jun. 2011.