Zahn, L. (1969). Klaus Jürgen-Fischer.
Cita Chicago (17th ed.)Zahn, Leopold. Klaus Jürgen-Fischer. Freiburg i. Br, 1969.
Cita MLA (8th ed.)Zahn, Leopold. Klaus Jürgen-Fischer. 1969.
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA (7th ed.)