APA

Koffman ، Laurence, .The Law Of Contract. New York : Oxford ، 2010: .

Chicago

Koffman ، Laurence, .The Law Of Contract. New York : Oxford ، 2010: .

Harvard

Koffman ، Laurence, .The Law Of Contract. New York : Oxford ، 2010: .

MLA

Koffman ، Laurence, .New York : Oxford ، 2010: . .