Gaya APA

Scharbert, C, S, M, F, S, S, E, A, S, P. (2012). "The CPO: transforming procurement in the real world| . California: Apress.

Gaya MLA

Scharbert, Christian, Schuh,, Michael, F., Strohmer,, Stephen, Easton,, Armin, Scharlach,, Peter. ""The CPO: transforming procurement in the real world|". California: Apress, 2012. book.