1. Dr. Seuss's sleep book;Seuss,1962
2. From those wonderful folks who gave you Pearl Harbor;Delia Femina,1977
3. Validity of focus group findings;Reynolds;Journal of Advertising Research,1978
4. Focus groups and the nature of qualitative research;Calder;Journal of Marketing Research,1977
5. The research craft: An introduction to social science methods;Williamson,1977