პილკომაიო (წყარმალუ): გინორთი გინოჯინეფს შქას

*Pilcomayo River. (2010). In Encyclopædia Britannica. Retrieved January 18, 2010, from Encyclopædia Britannica Online: http://www.britannica.com/EBchecked/topic/460371/Pilcomayo-River

*W. H. Strosnider, F. Llanos, R.W. Nairn: [http://dept.ca.uky.edu/asmr/W/Full%20Papers%202008/1232-Strosnider-OK.pdf ''LEGACY OF NEARLY 500 YEARS OF MINING IN POTOSÍ, BOLIVIA: STREAM WATER QUALITY''] (pdf) - conference paper at the ''2008 National Meeting of the American Society of Mining and Reclamation. New Opportunities to Apply Our Science'', June 14–19, Richmond, VA.