1. The Under-50 and Over-50 Travelers: A profile of similarities and differences;Anderson;Journal of Travel Research,1982
2. Intercultural Communication;Argyle,1982
3. Introducción al Test Sociométrico;Arruga,1974
4. Women and Travel;Bartos;Journal of Travel Research,1982
5. Las Profesiones Turísticas;Barrio Moreno;Estudios Turísticos,1966