TY  - BOOK
AU  - Guba, Egon G.
AU  - Lincoln, Yvonna S. 
TI  - Fourth generation evaluation 
SN  - 0803932359
U1  - 001.4 23rd ed.
PY  - 1989///
CY  - New Delhi 
PB  - Sage Publication 
KW  - EVALUATION- METHODOLOGY, NEGOTIATION
ER  -