APA Style
DEL, G., EGGER, C. (2015).
World Sustainable Energy Days Next 2014
Conference Proceedings .
Springer Fachmedien Wiesbaden:
Springer Vieweg Wiesbaden.
MLA Style
DEL, Gerhard., EGGER, Christiane.
"World Sustainable Energy Days Next 2014
Conference Proceedings".
Springer Fachmedien Wiesbaden:
Springer Vieweg Wiesbaden,
2015.
Text.