World Tourism Organization - Sustainable development of tourism.
Global Sustainable Tourism Council - Sustainable tourism criteria.
Centers for Desease Control and Prevention.
Muebles Tontem - Design and construction of Chelemhá Lodge
PROEVAL RAXMU Bird Monitoring Program
Foundation for Species Conservation of German zoological Gardens. Supports projects for the conservation of theatened species.
GEO schützt den Regenwald e.V.
Supported the conservation work in Chelemhá.
CAYAYA BIRDING. Birdwatching in Guatemala.
Association of private protected areas in Guatemala. (in Spanish)
Los Tarrales Reserve, southern slope of Atitlán volcano.
Ornithological Society of Guatemala.