1. Resnik DB (2011) What is ethics in research and why is it important? http://www.niehs.nih.gov/research/resources/bioethics/whatis/
2. On being a scientist. A guide to responsible conduct in research. Third Edition (2009) graduateschool.nd.edu/assets/21763/on_being_a_scientist.pdf
3. Steneck NH (2007) Office of research integrity—introduction to responsible conduct of research. Department of Health and Human Services, USA. http://ori.hhs.gov/ori-intro
4. Sumner JB (1946) The chemical nature of enzymes. Nobel Prize Lecture. http://www.nobelprize.org/nobel_prizes/chemistry/laureates/1946/sumner-lecture.html
5. Chemistry explained. James Sumner, American Biochemist. http://www.chemistryexplained.com/St-Te/Sumner-James.html