editor, Lawrence H. Summers and Shekhar Shah
World Bank, 1993
Buku Teks
edited by B. R. Williams
John Wiley & Sons, 1973
Buku Referensi
Association for Computing Machinery
Society for Industrial and Applied Mathematics, 2005
eBooks
Siregar, Lucyana Trisulo Negoro, author
Program Pascasarjana Universitas Indonesia, 2005
UI - Tesis (Membership)
Cook, Franklin Henry
Macmillan, 1951
Buku Teks