Aplied Mathematics and Modeling ...............
Buku Teks
Ferris, Brian
World problems
Hulton Educational Publications, 1973
Buku Teks
Henslin, James M.
Social problems
McGraw-Hill, 1983
Buku Teks
Palen, J. John
Social problems
McGraw-Hill, 1979
Buku Teks
Brown, Milton P.
Problems in marketing
New York, N.Y. , McGraw-Hill
Buku Teks