(1999). Helmut Gutbrod.
Cita Chicago (17th ed.)Helmut Gutbrod. Berlin, 1999.
Cita MLA (8th ed.)Helmut Gutbrod. 1999.
Atenció: Aquestes cites poden no estar 100% correctes.
(1999). Helmut Gutbrod.
Cita Chicago (17th ed.)Helmut Gutbrod. Berlin, 1999.
Cita MLA (8th ed.)Helmut Gutbrod. 1999.