MLA

Backhaus, Jürgen Georg, and Frank Stephen. The Beginnings of Political Economy. Springer US, 2009.

APA

Backhaus, J. Georg, & Stephen, F. (2009). The Beginnings of Political Economy. Springer US.

Chicago

Backhaus, Jürgen Georg, Jürgen Georg Backhaus, and Frank Stephen. The Beginnings of Political Economy. : Springer US, 2009.