Cita APA (7th ed.)

Bielfeldt, A., & Walsemann, E. (1912). Altonaer Stadtkalender. Hammerich & Lesser.

Cita Chicago (17th ed.)

Bielfeldt, August, i Edgar Walsemann. Altonaer Stadtkalender. Altona: Hammerich & Lesser, 1912.

Cita MLA (8th ed.)

Bielfeldt, August, i Edgar Walsemann. Altonaer Stadtkalender. Hammerich & Lesser, 1912.