APA (7th ed.) Zitazioa

Abt, F. (1921). Practical singing tutor for soprano or tenor. G. Schirmer.

Chicago Style (17th ed.) Zitazioa

Abt, Franz. Practical Singing Tutor for Soprano or Tenor. Nueva York: G. Schirmer, 1921.

MLA (9th ed.) Zitazioa

Abt, Franz. Practical Singing Tutor for Soprano or Tenor. G. Schirmer, 1921.