Wilson, Bright E., Jr.
Dover Publications, 1990
Buku Teks SO
Churchman, Charles West, 1913-
John Wiley & Sons, 1957
Buku Teks
Churchman, Charles West, 1913-
Wiley, 1957
Buku Teks
Churchman, Charles West, 1913-
John Wiley & Sons, 1961
Buku Teks SO
Hillier, Frederick S.
McGraw-Hill, 1995
Buku Teks SO