↑Baker, Christopher P. (2007). Costa Rica. Moon Handbooks (6th ed.). Emeryville, California: Avalon Travel. p. 516. ISBN 978-1-56691-847-3
↑Hopkins, Jack W. (1995). Policymaking for Conservation in Latin America: National Parks, Reserves, and the Environment. Westport, Connecticut: Greenwood Publishing Group. p. 18. ISBN 0-275-95349-1