Budd, Thomas A.
Alexander Hamilton Institute, 1961
Buku Teks
Parker, R.H.
Penguin Books, 1972
Buku Teks
White, Gerald I.
John Wiley & Sons, 1994
Buku Teks
Hills, George S.
Garland Pubishing, 1982
Buku Teks
Hammill, A.E.
Institute of Chatered Accountants, 1979
Buku Teks