Muller-Lutz, Heinz L.
Verlag Versicherungswirtschaft, 1994
Buku Referensi
Kongstvendt, Peter R.
Jones & Bartlet Learning, 2009
Buku Teks
Black, Kenneth
Prentice-Hall, 2000
Buku Teks
R & R Newkirk/Longman, 1985
Buku Referensi
Larry E. Breitenbach ...[et al.]
Health Insurance Association, 1994
Buku Teks