1"3 Surprising Risks of Poor Posture." Harvard Health Publishing. September 2018. Accessed: February 28, 2020.
2"Back Pain Facts and Statistics." American Chiropractic Association. Accessed: February 29, 2020.
3Been, Ella, et al. Spinal Evolution. Seattle, WA: Spring, 2019.
4Hearn, Editha. You are as Young as Your Spine. Charlottetown, Montreal, Canada: Bunim & Bannigan Ltd., 2006.
5Johnston, Richard. "Shrew Has a Spine of Godly Strength." Nature, July 14, 2013. Accessed: March 1, 2020.
6Krough, David. Biology: A Guide to the Natural World. Benjamin Cummings, 2011.
7" Vertebral Column." Encyclopedia Britannica. Accessed: February 29 ,2020.
8"Spine." Online Etymological Dictionary. Accessed: March 1, 2020.