Webber, Ross A.
Richard D. Irwin, 1981
Buku Teks
Webber, Ross A.
N.Y. Van Nostrand Reinhold , 1972
Buku Teks
Corrigan, Paul, author
Bhuana Ilmu Populer, 1999
Buku Teks
Moriaki, Tsuchiya
LTCB International Library Foundation, 1997
Buku Teks
The Conference Board; editor, Edward C. Bursk
The Free Press, 1973
Buku Teks