R & R Newkirk/Longman, 1985
Buku Referensi
Ingrisano, John R.
Chicago, Dearborn Financial Publishing, 1990
Buku Referensi
Larry E. Breitenbach ...[et al.]
Health Insurance Association, 1994
Buku Teks
Morton, Gene A.
Fishergate, 1986
Buku Teks
by Health Insurance Association of America
Health Insurance Association of America, 1994
Buku Teks