Originál: Interval Flashcards in D, A, B-flat and E-flat. Heather Rathnau. Edited by Heather Rathnau. For General Music Theory.
Preklad: Interval Flashcards v D, A, B-byt a E-ploché. Interval Flashcards v D, A, B-byt a E-byt zložené Heather Rathnau. 8 1.