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Lee 1996, Abstract Lee, Michael S. Y. (January 22, 1996). "The Homologies and Early Evolution of the Shoulder Girdle in Turtles". Proc. R. Soc. Lond. B. 263 (1366): 111–117. doi:10.1098/rspb.1996.0018. S2CID84529868.
shoulderus.com
Arend CF. Ultrasound of the Shoulder. Master Medical Books, 2013. Chapter on os acromiale available at ShoulderUS.com