User:Yath/sandbox0

Textbooks using $$\epsilon_0\ $$:


 * 1) Edmonds, Dean S. Jr. Cioffari's Experiments in College Physics . New York: Houghton Mifflin, 1997. ISBN 0-669-41830-7

Textbooks using $$\varepsilon_0$$:


 * 1) Halliday, David, Robert Resnick, and Jearl Walker. Fundamentals of Physics . 6th ed. New York: John Wiley & Sons, 2001. ISBN 0-471-32000-5
 * 2) Wehr, Russell M., James A Richards, Jr., and Thomas W. Adair, III. Physics of the Atom . 4th ed. Reading, Mass.: Addison-Wesley, 1984. ISBN 0-201-08878-9

Websites using $$\epsilon_0\ $$:


 * 1) University of Pennsylvania
 * 2) Wolfram Research
 * 3) McGraw-Hill
 * 4) University of Texas at Austin

Websites using $$\varepsilon_0$$:


 * 1) Georgia State University Department of Physics and Astronomy
 * 2) Plus 2 Physics
 * 3) MATTER Initiative for Schools

Confused websites:


 * 1) NIST

Potentially authoritative sources:
 * permittivity of a vacuum at IUPAC Compendium of Chemical Terminology - $$\varepsilon_0$$