Troëng, Sebastian; Mangel, Jeff; Kélez, Sheleyla; Meyers, Andy; et al. (22 February 2000). "Report on the 1999 Green Turtle Program at Tortuguero, Costa Rica"(PDF). Caribbean Conservation Corporation and the Ministry of Environment and Energy of Costa Rica. pp. 11, 21–23, 29, 32. Archived from the original(PDF) on 27 November 2018. Retrieved 27 November 2018.
web.archive.org
Troëng, Sebastian; Mangel, Jeff; Kélez, Sheleyla; Meyers, Andy; et al. (22 February 2000). "Report on the 1999 Green Turtle Program at Tortuguero, Costa Rica"(PDF). Caribbean Conservation Corporation and the Ministry of Environment and Energy of Costa Rica. pp. 11, 21–23, 29, 32. Archived from the original(PDF) on 27 November 2018. Retrieved 27 November 2018.