- Author: Oscar Castro-Orgaz Willi H. Hager (auth.)
- Language: English
- Year: 2017
- Author: PD Dr. sc. techn. Dipl. Bau-Ing. Willi H. Hager (auth.)
- Language: German
- Year: 1994
- Author: Willi H. Hager (auth.)
- Language: English
- Year: 1992
- Author: Corrado Gisonni Willi H. Hager (auth.)
- Language: Italian
- Year: 2012
- Author: Willi H. Hager (auth.)
- Language: English
- Year: 2010