MLA

Bernd Stoffel, em. Dr.-Ing. Assessing the Energy Efficiency of Pumps and Pump Units. Elsevier, 2015.

APA

Bernd Stoffel, e. Dr.-Ing. (2015). Assessing the Energy Efficiency of Pumps and Pump Units. Elsevier.

Chicago

Bernd Stoffel, em. Dr.-Ing Assessing the Energy Efficiency of Pumps and Pump Units. : Elsevier, 2015.