Kray, R., Oettermann, S., Riha, K., & Zelle, C. (1994). Herakles, Herkules. Stroemfeld/Roter Stern.
Cita Chicago (17th ed.)Kray, Ralph, Stephan Oettermann, Karl Riha, i Carsten Zelle. Herakles, Herkules. Basel ; Frankfurt am Main: Stroemfeld/Roter Stern, 1994.
Cita MLA (8th ed.)Kray, Ralph, et al. Herakles, Herkules. Stroemfeld/Roter Stern, 1994.
Atenció: Aquestes cites poden no estar 100% correctes.