Grant, C.C., N. Claassen, and M. Viljoen. “Stress Response of the Autonomic Nervous System on Skydiving and Freefall”. Suid-Afrikaans Tydskrif vir Natuurwetenskap en Tegnologie / <i>South African Journal of Science and Technology</i&gt; 25, no. 1 (September 22, 2006): 32-39. Accessed December 22, 2024. http://satnt.co.za/index.php/satnt/article/view/151.