Gaya APA
Horacek, L.
(1989).
Programmed ear training : 2st : Vol. I
(
2)
.
florida:
Harcourt Brace Jovanovich.
Gaya MLA
Horacek, Leo.
"Programmed ear training : 2st : Vol. I".
2
florida:
Harcourt Brace Jovanovich,
1989.
Text.