Cita APA (7th ed.)

Schlüter, I. (1999). 235-mal Zwillinge. Hamburg in Zahlen.

Cita Chicago (17th ed.)

Schlüter, Isolde. "235-mal Zwillinge." Hamburg in Zahlen 1999.

Cita MLA (8th ed.)

Schlüter, Isolde. "235-mal Zwillinge." Hamburg in Zahlen, 1999.