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)

Luu, Q., Nguyen, M., Nguyen-Viet, H., Pham, G., Dinh-Xuan, T., MacDonald, L., & Pham-Duc, P. (1969). Community Participatory Interventions to Improve Farmer Knowledge and Practices of Household Biogas Unit Operation in Ha Nam Province, Vietnam. Journal of Public Health Management and Practice : JPHMP, 24 Suppl 2 Supplement, Public Health in Vietnam, S28-S35. https://doi.org/10.1097/PHH.0000000000000727 (Original work published 1969)