1. Fomento del Turismo Científico en Costa Rica;Boza;Biocenosis,1980
2. Professional Women and Their Mentors;Collins,1983
3. Mail and Telephone Surveys: The Total Design Method;Dillman,1978
4. Costa Rica/Panama;EIU: The Economist Intelligence Unit;International Tourism Reports,1987
5. Tourism and Physical Environment Research;Farrell;Annals of Tourism Research,1987