APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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