Cita APA (7a ed.)

Hellwig, G. (1979). Oper, Operette, Musical ([4a ed.].). Herder.

Cita Chicago Style (17a ed.)

Hellwig, Gerhard. Oper, Operette, Musical. [4a ed.]. Freiburg: Herder, 1979.

Cita MLA (9a ed.)

Hellwig, Gerhard. Oper, Operette, Musical. [4a ed.]. Herder, 1979.