Kerr, Alastair James. The principles of the law of contract / by A.J. Kerr. - 4th ed. - Durban : Butterworths, 1989. - xvi, 723 p. ; 24 cm. Includes index. Includes bibliographical references (p. 659-664). ISBN: 0409037478 (pbk.) Subjects--Topical Terms: Contracts--South Africa.