Keyfitz, Nathan, author
John Wiley & Sons, 1977
Buku Teks
Keyfitz, Nathan, author
Addison-Wesley Publ., 1968
Buku Teks
Bradley, Stephen P., author
Addison-Wesley, 1977
Buku Teks
Ottesen, Johnny T., author
Society for Industrial and Applied Mathematics, 2004
eBooks
Academic Press, 1982
Buku Teks