Chandler, David P.: Voices from S-21. Terror and History in Pol Pot’s Secret Prison. University of California Press, Berkeley 1999, ISBN978-0-09-944919-5, p. 58 f. (Keo Meas, p. 58, at Google Books).
Tyner, James A.: From Rice Fields to Killing Fields. Nature, Life, and Labor under the Khmer Rouge. Syracuse University Press, Syracuse (NY) 2017, ISBN978-0-8156-5422-3 (Keo Meas at Google Books).