Cita APA (7a ed.)

Hamerling, R. (1889). Hamerling-Album. [s.n.].

Cita Chicago Style (17a ed.)

Hamerling, Robert. Hamerling-Album. Wien: [s.n.], 1889.

Cita MLA (9a ed.)

Hamerling, Robert. Hamerling-Album. [s.n.], 1889.