Hansluwka, Harald, author
[Publisher not identified], 1986
Buku Teks
Preston, Samuel H., author
Academic Press, 1976
Buku Teks
Gershenson, Harry, author
Society of Actuaries, 1961
Buku Teks
United Nations
1986
Buku Teks
Fredy Tjekden, author
Program Pascasarjana Universitas Indonesia, 2009
UI - Tesis (Open)