Gershenson, Harry
Society of Actuaries, 1961
Buku Teks SO
Hansluwka, Harald
[Publisher not identified], 1986
Buku Teks SO
Cochrane, Susan H.
World Bank, 1983
Buku Teks
Preston, Samuel H.
Academic Press, 1976
Buku Teks SO
Eka Ginanjar
University of Indonesia. Faculty of Medicine, 2019
Artikel Jurnal