MLA

Fricker, Samuel A, Anastasius Gavras, and Christoph Thümmler. Requirements Engineering for Digital Health. Springer International Publishing, 2015.

APA

Fricker, S. A, Gavras, A., & Thümmler, C. (2015). Requirements Engineering for Digital Health. Springer International Publishing.

Chicago

Fricker, Samuel A., Anastasius Gavras, and Christoph Thümmler. Requirements Engineering for Digital Health. : Springer International Publishing, 2015.