Kerr's research interests embraced
contract,
agency, sale,
lease and
customary law. His first two books were
Native common law of immovable property in South Africa (1953) and
The Native Law of Succession in South Africa (1961). These two works were later combined under the title
The Customary Law of Immoveable Property and of Succession, which has run to three editions. In 1963, his
jurisprudential work,
Law and Justice, a Christian Exposition, was published. Perhaps his best-known and most influential books are
The Principles of the Law of Contract, now in its sixth edition (2002);
The Law of Agency, his PhD thesis, now in its third edition (1991); and
The Law of Lease (1969), which has been subsumed into a larger work entitled
The Law of Sale and Lease, now in its third edition (2004). Kerr also wrote a smaller, two-volume work,
Introduction to the Law of Contract (1994), now in its second edition, designed for
commercial law students, as well as the preliminary note to the "Lease" section of
The South African Encyclopaedia of Farms and Precedents other than Court Forms. Kerr was also responsible for the chapter on "Customary Family Law" in Butterworths' Family Law Service (edited by
Brigitte Clark), the contributions on
Sale in The Law of South Africa (vol. XXIV, edited by Professor
Willem A. Joubert) and the re-issue of that volume, along with the contributions on lease in the First Re-issue Vol 14 (the original text having been by
JG Lötz). Kerr published well over 100 items in leading
law journals and other periodicals. == Bibliography ==