Baumgartner, Wilfrid S.
Paris , International Chamber of Commerce
Buku Teks
Ball, Donald A., author
Irwin/McGraw-Hill, 2002
Multimedia
Yoshino, Michael Y., author
Harvard University Press, 1980
Buku Teks
N.J. The Darwin Press , 1986
Buku Teks
Darwin Press , 1972
Buku Teks