- Author: Dr. phil. nat. Gerhard Zapf Dipl.-Ing. Jörg Niessen (auth.)
- Language: German
- Year: 1973
- Author: Dr. phil. nat. Gerhard Zapf (auth.)
- Language: German
- Year: 1958
- Author: Thomas Weise Michael Zapf Raymond Chiong Antonio J. Nebro (auth.) Raymond Chiong (eds.)
- Language: English
- Year: 2009
- Author: Patricia Zapf Ronald Roesch
- Language: English
- Year: 2008
- Author: Ronald Roesch Patricia A. Zapf Stephen D. Hart
- Language: English
- Year: 2009