statoids.com. [21 March 2016]. (原始内容存档于2017-07-18). EDITORIAL: Important step. The Himalayan Times. 1 September 2017 [5 September 2017]. (原始内容存档于2017-09-05)
Hardy. The Complete Pool Manual for Homeowners and Professionals: A Step-by-Step Maintenance Guide. Atlantic Publishing Company. 2007: 79, 264. ISBN 1601380224