References

Information
http://faculty.clintoncc.suny.edu/faculty/Michael.Gregory/files/Bio%20102/Bio%20102%20Laboratory/frog%20dissection/frog%20dissection.pdf
http://wwwbio200.nsm.buffalo.edu/labs/tutor/Clam/Clam36D.html
http://muscularsystemashe.weebly.com/mollusca.html
http://thehardclareasources.weebly.com/digestive-system.html
http://www.tutorvista.com/biology/digestive-system-of-a-frog
http://en.wikipedia.org/wiki/Bivalvia#Nervous_system
http://www.tutorvista.com/biology/nervous-system-of-a-frog
https://animalplanet.wikispaces.com/Brubaker,+Cook+Invertebrate+Reflection+and+Analysis
http://www.tutorvista.com/content/biology/biology-iii/animal-morphology/skeletal-digestive-circulatory-system-frog.php#