Keeton, Robert E.
Dow Jones-Irwin, Inc., 1967
Buku Teks
Keeton, Robert E.
Little, Brown and Co., 1965
Buku Teks
Poh, Chu Chai
LexisNexis, 2010
Buku Teks
Rokes, Willis Park
Cal. Insurors Press , 1971
Buku Teks
O`Connell, D. P.
Stevens & Sons Limited, 1970
Buku Teks