Horlbeck-Kappler, I. (1975). Irmgard Horlbeck-Kappler.
Cita Chicago (17th ed.)Horlbeck-Kappler, Irmgard. Irmgard Horlbeck-Kappler. Leipzig, 1975.
Cita MLA (8th ed.)Horlbeck-Kappler, Irmgard. Irmgard Horlbeck-Kappler. 1975.
Atenció: Aquestes cites poden no estar 100% correctes.