US Dept of Labor (OSHA Standards)
CCRMA (Center for Computer Research in Music and Acoustics)
Musical Acoustics (Center for Computer Research in Music and Acoustics)
Julius Orion Smith (University of California at Stanford)
Diana Deutsch (University of California at San Diego)
IRCAM ( Institut de Recherche at Coordination Acoustique/Musique)
Dan Russell, Ph.D., Associate Professor of Applied Physics at Kettering University in Flint, MI
Chrysalis Foundation - Home of Cris Forster - designer of innovative new musical instrument
Daves Short course in Trigonometry