MLA

Rory V. O‘Connor, Jan Pries-Heje, Richard Messnarz, Richard Messnarz, and Jan Pries-Heje. Systems, Software and Service Process Improvement. Springer Berlin Heidelberg, 2011.

APA

Rory V. O‘Connor, R. Messnarz, Messnarz, R., & Pries-Heje, J. (2011). Systems, Software and Service Process Improvement. Springer Berlin Heidelberg.

Chicago

Rory V. O‘Connor, Jan Pries-Heje, Richard Messnarz, Richard Messnarz, and Jan Pries-Heje. Systems, Software and Service Process Improvement. : Springer Berlin Heidelberg, 2011.