1. Guidelines for Drinking-Water Quality 2nd ed.; Addendum to Vol. 1. Recommendations of Boron, pp 4−6, and Addendum to Vol. 2, Boron, pp 15−29; World Health Organisation: Geneva, 1998.
2. Guidelines for Drinking-Water Quality. 3rded., Vol. 1,Recommendations; World Health Organisation: Geneva, 2004.