Chien, Lung-Chang, and Hasanat Alamgir. “Geographic Disparities of Asthma Prevalence in South-Western United States of America”. Geospatial Health 9, no. 1 (November 1, 2014): 97-108. Accessed July 11, 2020. https://geospatialhealth.net/index.php/gh/article/view/8.