1. Arias, M.C., Valery, A.I., 1999. Evaluation of Protected Areas Management Effectiveness: Analysis of Procedures and Outline for a Manual. WWF Centroamerica, Turrialba, Coast Rica.
2. Fundamentals of Social Research: First Canadian Edition;Babbie,2002
3. Evaluation in Practice. A Methodological Approach;Bingham,2002
4. Transforming Qualitative Information: Thematic Analysis and Code Development;Boyatzis,1998
5. Effectiveness of parks in protecting tropical biodiversity;Bruner;Science,2001