Cita APA (7th ed.)

Barton, J. (1990). Towards a General Law of Contract. Duncker & Humblot.

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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