Villalaz, F. (1969). Insolvenzen in Hamburg 1950-1968. Hamburg in Zahlen.
Cita Chicago (17th ed.)Villalaz, Francisco. "Insolvenzen in Hamburg 1950-1968." Hamburg in Zahlen 1969.
Cita MLA (8th ed.)Villalaz, Francisco. "Insolvenzen in Hamburg 1950-1968." Hamburg in Zahlen, 1969.
Atenció: Aquestes cites poden no estar 100% correctes.