Weston, J. Fred. creator Chung, Kwang S. Hoag, Susan E. S.l.] Prentice Hall 1990 608 p. ; 24 cm. J. Fred Weston, Kwang S. Chung, Susan E. Hoag. 338.830973 0135771722 (hardcover) 9780135771723 (hardcover) http://www.amazon.com/exec/obidos/ASIN/0135771722/chopaconline-20 http://www.amazon.com/exec/obidos/ASIN/0135771722/chopaconline-20