Pham, G. ., Lam, S. ., Dinh-Xuan, T. ., & Nguyen-Viet, H. . (1969). Evaluation of an Ecohealth Approach to Public Health Intervention in Ha Nam, Vietnam. Journal of Public Health Management and Practice : JPHMP, 24 Suppl 2 Supplement, Public Health in Vietnam, S36-S43. https://doi.org/10.1097/PHH.0000000000000732 (Original work published 1969)