"Earliest Usages: 1. Pitch" in Byrd, Donald (2010-05-12). "Extremes of Conventional Music Notation". Indiana University, School of Informatics (website material based in part on work supported by the National Science Foundation). Archived from the original on 2010-03-08. Retrieved 2011-08-29.
Vosbein, Terry (January 2002). "Pete Rugolo and Progressive Jazz". Self-published (scholarly paper by established composer and educator presented at the IAJE International Conference, Chicago). Archived from the original on 2007-09-12. Retrieved 2007-08-17.
"Earliest Usages: 1. Pitch" in Byrd, Donald (2010-05-12). "Extremes of Conventional Music Notation". Indiana University, School of Informatics (website material based in part on work supported by the National Science Foundation). Archived from the original on 2010-03-08. Retrieved 2011-08-29.
Vosbein, Terry (January 2002). "Pete Rugolo and Progressive Jazz". Self-published (scholarly paper by established composer and educator presented at the IAJE International Conference, Chicago). Archived from the original on 2007-09-12. Retrieved 2007-08-17.