Gray, Henry (1918). "Introduction". Anatomy of the Human Body (20th ed.). Archived from the original on 16 March 2007. Retrieved 19 March 2007 – via Bartleby.com.
booktionary.com.ng
Rotimi, Booktionary. "Anatomy". Archived from the original on 1 August 2017. Retrieved 18 June 2017.
Rotimi, Booktionary. "Anatomy". Archived from the original on 1 August 2017. Retrieved 18 June 2017.
Gray, Henry (1918). "Introduction". Anatomy of the Human Body (20th ed.). Archived from the original on 16 March 2007. Retrieved 19 March 2007 – via Bartleby.com.