Mueller, R., Stiefel, E., & Brücher, H. (1972). Doing business in Germany: A legal manual (7th fully rev. ed.). (am Main), Knapp.

Mueller, Rudolf, Ernst Stiefel, and Horst Brücher. Doing Business in Germany: A Legal Manual. 7th fully rev. ed. Frankfurt: (am Main), Knapp, 1972.

Mueller, Rudolf, et al. Doing Business in Germany: A Legal Manual. 7th fully rev. ed. (am Main), Knapp, 1972.