Frans Boekema
Edward Elgar, 2000
Buku Teks
editor Paige Leavitt
American Productivity & Quality Center , 2003
Buku Teks
Myrdal, Gunnar, 1898-, author
Gerald Dukworth & Co. Ltd., 1957
Buku Teks
Seth, M.L., author
S. Chand, 1969
Buku Teks
Information Science Pub., 2004
Buku Teks