Blake, Robert R.
Texas Gulf, 1961
Buku Teks
Churchman, Charles West, 1913-
Prentice-Hall, 1961
Buku Teks
Thomas, Howard
Pitman, 1972
Buku Teks
Moore, Peter G.
Longman , 1972
Buku Teks
edited by Mario T. Tabucanon and Vira Chankong ; conference sponsors, the Federation of Thai Industries [and others]
The Asian Institution of Technology, 1989
Buku Referensi