- Author: Michael Span
- Language: German
- Year: 2017
- Author: Christopher M. Span
- Language: English
- Year: 2012
- Author: Paula Span
- Language: English
- Year: 2009
- Author: Gerhard Steger, Hannah Rosenbach, Ingrid Span
- Language: English
- Author: Swain Susan, C-SPAN, Smith Richard Norton
- Language: English
- Year: 2015
- Author: C-SPAN., Swain Susan, Lamb Brian
- Language: English
- Year: 2010
- Author: Brian Lamb, C-Span
- Language: English
- Year: 2010
- Author: Emmerich Wilhelm Emmerich Wilhelm Trevor Letcher Mark McLinden Roland Span Ivan Cibulka Jacobo Troncoso Augustinus Asenbaum Toshiharu Takagi Stanislaw Randzio Carlos Lafuente Kvetoslav Ruzicka Glenn Hefter Yizhak Marcus Tigran Chalikian Felipe Blas J P Martin Trusler Diego Gonzalez- Salgado Andriy Kovalenko
- Language: English
- Year: 2014