Cita APA (7a ed.)

Oettinger, E. M. (1869). Offenes Billet-doux an ... Richard Wagner. [s.n.].

Cita Chicago Style (17a ed.)

Oettinger, Eduard Maria. Offenes Billet-doux an ... Richard Wagner. Dresden: [s.n.], 1869.

Cita MLA (9a ed.)

Oettinger, Eduard Maria. Offenes Billet-doux an ... Richard Wagner. [s.n.], 1869.