Cita APA (7a ed.)

Müller, W. (1903). Diary and Letters. [s.n.].

Cita Chicago Style (17a ed.)

Müller, Wilhelm. Diary and Letters. Chicago: [s.n.], 1903.

Cita MLA (9a ed.)

Müller, Wilhelm. Diary and Letters. [s.n.], 1903.