Vittayakorn, S., N. Satiansukpong, S. Sung-U, M. Pongsaksri, C. Phiraban, and D. Sasat. “The Effect of Thai elephant–assisted Therapy Program on Sensory Processing Function in Persons With Autism”. Journal of Associated Medical Sciences, vol. 42, no. 1, Jan. 2009, p. 57, https://he01.tci-thaijo.org/index.php/bulletinAMS/article/view/60096.