Portocarrero, César; Engility Corp. (2014). The Glacial Lake Handbook(PDF). USAID. Archived from the original(PDF) on 2015-03-19. Retrieved 2016-11-06.
Portocarrero, César; Engility Corp. (2014). The Glacial Lake Handbook(PDF). USAID. Archived from the original(PDF) on 2015-03-19. Retrieved 2016-11-06.