Waterlow & Sons , 1970
Buku Teks
Kirkman, Patrick R. A.
George Allen and Unwin, 1977
Buku Teks
Hansell, D. S.
MacDonald and Evans, 1985
Buku Teks
Ivamy, E.R. Hardy
Butterworths Insurance Library, 1985
Buku Teks
Ivamy, E.R. Hardy, author
Butterworth, 1971
Buku Teks