Li, Tsung-Hsien, Evonne Lim, I-Chun Chen, Chuen-Fu Lin, Shih-Chu Chen, and Ming-An Tsai. 2022. “Environmental enrichment and the behavioral effects on captive Beluga whales (Delphinapterus leucas)”. The Thai Journal of Veterinary Medicine 52 (3):559-65. https://he01.tci-thaijo.org/index.php/tjvm/article/view/258654.