The Cambridge Encyclopedia, 1990, Cambridge University Press, Cambridge, UK
Source: http://www.innerbody.com/anatomy/skeletal-male retrieved 24/02/2014
Picture: Body Parts
Source: http://www.google.co.th/imgres?newwindow=1&sa=X&rlz=1T4SNCA_enTH530TH530&biw=688&bih=
394&tbm=isch&tbnid=pMYao-izQmAVtM%3A&imgrefurl=http%3A%2F%2Fhumanbodysecret.blogspot.com
%2F2012%2F03%2Fhuman-body-parts.html&docid=mB--cIZI2Jp5vM&imgurl=http%3A%2F%2F3.bp.blogspot.com%2F-0hCeiUHoJow%2FT1-fxo0KafI%2FAAAAAAAAACo%2F1xAErJbcMyA%2Fs1600%2FHuman_body_features.jpg
&w=1600&h=1341&ei=f7gWU_XyHonbkAXX04CACg&zoom=1&iact=rc&dur=562&page=1&start=0&ndsp=10
&ved=0CFUQrQMwAQ retrieved 05/03/2014
Figure 2: Heart Anatomy
http://www.google.co.th/imgres?newwindow=1&sa=X&rlz=1T4SNCA_enTH530TH530&biw=
1024&bih=570&tbm=isch&tbnid=jAepnHP2s4nk5M%3A&imgrefurl=
http%3A%2F%2Fen.wikipedia.org%2Fwiki%2FHuman_heart&docid=H1bjnVvnXLD6nM&imgurl=
http%3A%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fcommons%2F1%2F15%2F
Anatomy_Heart_English_Tiesworks.jpg&w
=1024&h=669&ei=mdkWU-CXLbGUiAean4HYCw&zoom=1&iact=rc&dur=344&page=1&start=0&ndsp=8&ved=0CF8QrQMwAg
retrieved 05/03/2014
Figure 3: Heart Valves
http://en.wikipedia.org/wiki/File:Blausen_0457_Heart_SectionalAnatomy.png retrieved 05/03/2014
http://www.medicalnewstoday.com/articles/7621.php retrieved 18/03/2014