1. Diving and Subaquatic Medicine;Edmonds,2002
2. Bennett and Elliotts Physiology and Medicine of Diving;Brubakk,2003
3. https://en.wikipedia.org/wiki/Circulatory_system.
4. https://en.wikibooks.org/wiki/Human_Physiology/The_cardiovascular_system.
5. Respiratory Physiology. The Essentials;West,2000