Some recommended textbooks 
James P. Spradley The Ethnographic Interview Holt, Rinehart and Winston, New York, 1979.
James P. Spradley Participant Observation Holt, Rinehart and Winston. Fort Worth. 1980
David M. Fetterman Ethnography Step by Step Applied Social Research Methods Series Vol. 17, Sage Publications, Newbury Park, Ca. 1989.
