Darawiroj, D., Tuaprakone, N. and Utara, Y. (2013) “An Anatomical, Histological and Ultrastructural Study on the Placenta of the Red-shanked Douc Langur (Pygathrix nemaeus)”, The Thai Journal of Veterinary Medicine, 42(3), pp. 297–303. available at: https://he01.tci-thaijo.org/index.php/tjvm/article/view/10985 (accessed: 17 September 2026).