TY  - BOOK
AU  - FRIEDRICHS, Jurgen
AU  - LUDTKE Harmut
TI  - Participant Observation
SN  - 0347010490
U1  - 301 
PY  - 1975///
CY  - England
PB  - Saxon House,D .C
KW  - Observation
N1  - Includes Appendices
ER  -