1. Avicenna: Scientist and Philosopher;Crombie,1952
2. The Englishman’s Food: a History of Five Centuries of English Diet;Drummond,1938
3. A Treatise of the Scurvy;Lind,1753
4. An Account of the Foxglove and Some of its Medical Uses With Practical Remarks on Dropsy and Other Diseases;Withering,1785
5. New approaches to patient recruitment and retention anticipate structural change in the clinical research enterprise. Tufts Center for the Study of Drug Development website. http://csdd.tufts.edu/news/complete_story/pr_tufts_csdd_2014_cost_study. Accessed October 14, 2015.