MLA

Schlechtriem, Peter, and Petra Butler. Un Law On International Sales. Springer Berlin Heidelberg, 2009.

APA

Schlechtriem, P., & Butler, P. (2009). UN Law on International Sales. Springer Berlin Heidelberg.

Chicago

Schlechtriem, Peter, and Petra Butler. UN Law On International Sales. : Springer Berlin Heidelberg, 2009.