APA (7th ed.) Citation

Vaccai, N., Marzials, T., & Baker, T. (1923). Practical Italian vocal method: For alto or baritone. G. Schirmer.

Chicago Style (17th ed.) Citation

Vaccai, Niccolo, Theo Marzials, and Theodore Baker. Practical Italian Vocal Method: For Alto or Baritone. New York: G. Schirmer, 1923.

MLA (9th ed.) Citation

Vaccai, Niccolo, et al. Practical Italian Vocal Method: For Alto or Baritone. G. Schirmer, 1923.