Groeg, O. J. (1979). Who's who in technology: Ed. Austria, Germany, Switzerland ; a biographical encyclopedia / ed. by Otto J. Groeg. Who's who Book u. Publ. Ges..
Citace podle Chicago (17th ed.)Groeg, Otto J. Who's Who in Technology: Ed. Austria, Germany, Switzerland ; a Biographical Encyclopedia / Ed. by Otto J. Groeg. Wörthsee b. München: Who's who Book u. Publ. Ges., 1979.
Citace podle MLA (8th ed.)Groeg, Otto J. Who's Who in Technology: Ed. Austria, Germany, Switzerland ; a Biographical Encyclopedia / Ed. by Otto J. Groeg. Who's who Book u. Publ. Ges., 1979.
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