Kostabi H., Semlek L. (1976) "Muusika elementaarteooria" Tallinn

Vikipeedia,Tritoon http://et.wikipedia.org/wiki/Tritoon (20.04.2012)

Programm "GOOD EAR" http://www.good-ear.com/

Programm "INTERVAL TRAINER" http://classic.musictheory.net/84

Virtuaalklaver http://www.bgfl.org/bgfl/custom/resources_ftp/cl

Kasutatud pildid:

Free-background-music.jpg http://www.howtodothings.com/files/u10023/free-background-musid.jpg

Flying Score http://www.wpclipart.com/music/notation/musical_notes_2/flying_score.png.html

Virtual keyboard piano Google.com