Electronic/World Wide Web>Internet Article:  academo.org, (2015), 19 TET Keyboard, Retrieved on 2016-02-05

Source Material [academo.org]

Electronic/World Wide Web>Internet Article:  David Jr., Jack H. (Spring 1995), The Mathematics of Music, Retrieved on 2016-02-05

Source Material [jackhdavid.thehouseofdavid.com]

Electronic/World Wide Web>Internet Article:  bowiesongs, (2010), Oh! You Pretty Things, Retrieved on 2016-01-19

Source Material [bowiesongs.wordpress.com]

Periodicals>Journal Article:  Minsky, Marvin (Fall 1981), Music, Mind, and Meaning, Computer Music Journal, Fall 1981, Vol. 5, Number 3, Retrieved on 2015-05-23

Source Material [web.media.mit.edu]

Audiovisual Media>Audio Recording:  Bowie, David (17 December 1971), Oh You Pretty Things, Trident Studios, Album: Hunky Dory, London, Retrieved on 2013-12-06

Books, Brochures, and Chapters>Book:  Greenberg , Robert (2007), Understanding the Fundamentals of Music, Retrieved on 2013-01-29

Source Material [books.google.com]