1. Kerr CE, Milne I, Kaptchuk TJ. William Cullen and a missing mind-body link in the early history of placebos (http://www.jameslindlibrary.org/illustrating/articles/william-cullen-and-a-missing-mind-body-link-in-the-early-history, last accessed 02/02/2014).
2. The history of placebo;Jütte;World Med J,2010
3. The early history of the placebo;Jütte;Complement Ther Med,2013
4. Cullen W. Clinical Lectures 1772-3 RCPE Manuscript Cullen 4/2 299-300 (facsimile: http://www.jameslindlibrary.org/illustrating/records/clinical-lectures/key_passages, last accessed 02/02/2014).
5. Cullen W. Clinical Lectures 1772 Feb/Apr RCPE Manuscript Cullen 4/4 218-9 (facsimile: http://www.jameslindlibrary.org/illustrating/records/clinical-lectures/key_passages, last accessed 02/02/2014).