Cita APA (7th ed.)

Green, N., Hartley, T. C., & Usher, J. A. (1991). The legal foundations of the single European market. Oxford University Press.

Cita Chicago (17th ed.)

Green, Nicholas, Trevor C. Hartley, i John A. Usher. The Legal Foundations of the Single European Market. Oxford: Oxford University Press, 1991.

Cita MLA (9th ed.)

Green, Nicholas, et al. The Legal Foundations of the Single European Market. Oxford University Press, 1991.