Schiffer, J., & Hommel, H. (1993). The XVIIth Congress of the European Athletic Coaches Association - The Jumping Events: Part 2. New studies in athletics, 8(3), S. 91-110.

Schiffer, Jürgen, and Helmar Hommel. "The XVIIth Congress of the European Athletic Coaches Association - The Jumping Events: Part 2." New Studies in Athletics 8, no. 3 (1993): S. 91-110.

Schiffer, Jürgen, and Helmar Hommel. "The XVIIth Congress of the European Athletic Coaches Association - The Jumping Events: Part 2." New Studies in Athletics 8.3 (1993): S. 91-110.