Từ Quang T., and D. Lê Phương. “Study on Biological Characteristics, Production Capacity and Economic Efficiency of the Eastern Spot-Billed Duck (anas Poecilorhyncha Zonorhyncha) Raised in Households in Ninh Binh Province”. SCIENTIFIC JOURNAL OF TAN TRAO UNIVERSITY, vol. 6, no. 17, Apr. 2021, pp. 6-12, doi:10.51453/2354-1431/2020/372.