David Johnston1989 年出版306 页ISBN:9780198252160;0198252161
An outline of the law of agency
by B. S. Markesinis1979 年出版252 页ISBN:0406622698
An outline of the law of contract
by G. H. Treitel.1979 年出版385 页ISBN:0406668477
THE NATURE AND SOURCES OF THE LAW
JOHN CHIPMAN GRAY SECOND EDITION1924 年出版348 页ISBN: