White, Jonathan Randall, author
Wardsworth, 2004
Buku Teks
edited by H.T. Banks, Carlos Castillo-Chavez
Society for Industrial and Applied Mathematics, 2003
eBooks
edited by George Papaellinas
Allen & Unwin, 1991
Buku Teks
National Institute for Defense Studies,
Majalah, Jurnal, Buletin
Lincoln, George A., author
Prentice-Hall, 1957
Buku Teks