APA

George C., . (2009). The psychological contract: managing and developing professional groups. New York: McGraw Hill Open University Press.

Chicago

George Christeen, . 2009. The psychological contract: managing and developing professional groups. New York: McGraw Hill Open University Press.

Harvard

George C., . (2009). The psychological contract: managing and developing professional groups. New York: McGraw Hill Open University Press.

MLA

George Christeen, . The psychological contract: managing and developing professional groups. New York: McGraw Hill Open University Press. 2009.