C. Chisuwan, T. Prasopkittikun, P. Sangperm, and S. Payakkaraung, “Predictive Power of Support from Husbands, Grandmothers, and Nurses on Duration of Exclusive Breastfeeding”, ์Nurs Sci J Thail, vol. 30, no. 1, pp. 70–80, Mar. 2012.