Hartley, T. C. (1998). The foundations of European Community law: An introduction to the constitutional and administrative law of the European Community (4th ed.). Oxford: Oxford University Press.

Hartley, Trevor C. The Foundations of European Community Law: An Introduction to the Constitutional and Administrative Law of the European Community. 4th ed. Oxford: Oxford University Press, 1998.

Hartley, Trevor C. The Foundations of European Community Law: An Introduction to the Constitutional and Administrative Law of the European Community. 4th ed. Oxford: Oxford University Press, 1998.