TY  - BOOK
AU  - Friedrichs Jurgen
AU  -  Ludtke Harmut
TI  - Participant observation :  Theory and practice.   
U1  - Yb4, L4 
PY  - 1975///
CY  - Westmead
PB  - Saxon House         
N1  - Bibliography P 239-252
ER  -