Skiing on the level :
official cross-country manual of the German ski school /
by Helmut Drescher & Jurgen Kemmler ; [translated by Manly Banister].

APA Citation

Drescher, H., Kemmler, J. (1974). Skiing on the level: official cross-country manual of the German ski school. New York: Sterling Pub. Co..

MLA Citation

Drescher, Helmut, and Jürgen Kemmler. Skiing On the Level: Official Cross-country Manual of the German Ski School. New York: Sterling Pub. Co., 1974.

Warning: These citations may not always be complete (especially for serials).