TY  - BOOK
AU  - DE WALT Kathleen M.
AU  -  DE WALT Billie R.
TI  - Participant observation:  A guide for fieldworkers   
U1  - Yb4, Q1 
PY  - 2011///
CY  - Lanham
PB  - Rowman & Littlefield Publishers Inc      
ER  -