1. A content analysis of subject areas and research methods used in five hospitality management journals;Baloglu;Journal of Hospitality and Tourism Research,1999
2. Content analysis in communication research;Berelson,1952
3. Qualitative research methods for the social sciences;Berg,2001
4. An introduction to content analysis. Qualitative research methods;Berg,2004
5. An Introduction to Content Analysis;Berg,2009