By Adam Gazzaley (Professor, University of California, San Francisco), Larry D. Rosen, PH.D. (Professor, California State University, Dominguez Hills)
By Jose L. Galvan (Professor Emeritus, California State University, Los Angeles.), Melisa C. Galvan (California State University, Northridge, USA)
By Rolland Trapp (Professor of Mathematics, Professor of Mathematics, California State University, San Bernardino)
