Green, D. C. creator text S.l.] Pearson 1999 monographic 1 v. (unpaged) ; Digital Electronics 817758068X (paperback) 9788177580686 (paperback) http://www.amazon.com/exec/obidos/ASIN/817758068X/chopaconline-20 http://www.amazon.com/exec/obidos/ASIN/817758068X/chopaconline-20