Cita APA (7th ed.)

Bull, J., & Balla, G. English Piano Music for the Young Musician. Editio Musica.

Cita Chicago (17th ed.)

Bull, John, i György Balla. English Piano Music for the Young Musician. Budapest: Editio Musica.

Cita MLA (8th ed.)

Bull, John, i György Balla. English Piano Music for the Young Musician. Editio Musica.