TY  - BOOK
AU  - Chang,Richard Y
AU  - Kelly,P.Keith
TI  - Step by step problem solving: a practial guide to ensure problems get (and stay) solved 
SN  - 1883553113
U1  - 658 
PY  - 1993///
CY  - Irvine, California
PB  - Richard Chang Associates
KW  - Administración
ER  -