1. WHO | Soil-transmitted helminth infections. In: WHO [Internet]. [cited 25 Feb 2017]. Available: http://www.who.int/mediacentre/factsheets/fs366/en/
2. Centers for Disease Control and Prevention. CDC—Ascariasis [Internet]. [cited 25 Feb 2017]. Available: http://www.cdc.gov/parasites/ascariasis/index.html
3. Centers for Disease Control and Prevention. CDC—Hookworm [Internet]. [cited 25 Feb 2017]. Available: http://www.cdc.gov/parasites/hookworm/index.html
4. Centers for Disease Control and Prevention. CDC—Trichuriasis [Internet]. [cited 25 Feb 2017]. Available: https://www.cdc.gov/parasites/whipworm/index.html
5. Distribution and impact of helminth diseases of livestock in developing countries;HJ Over,1992