Cita APA (7a ed.)

Barton, J. L. (1990). Towards a general law of contract. Duncker & Humblot.

Cita Chicago Style (17a ed.)

Barton, John L. Towards a General Law of Contract. Berlin: Duncker & Humblot, 1990.

Cita MLA (9a ed.)

Barton, John L. Towards a General Law of Contract. Duncker & Humblot, 1990.