Textbooks of obstetrics and midwifery (1850-1907)
				36. Churchill F (1850) On the Theory and Practice of Midwifery. London: Henry Renshaw. 37. Swayne JG (1856) Obstetric Aphorisms: For the use of students commencing midwifery practice. London: John Churchill. 38. Lusk WT (1882) The Science and Art of Midwifery.  New York: D Appleton and Company, pp214-215 39. Leishman W (1888) A System of Midwifery Glasgow James MacLehose & Sons. 40. Corney, BG (1899) Instructions with reference to the treatment of the umbilical cord. 41. King AFA (1907) A Manual of Obstetrics, Tenth Edition.  Lea Brothers & Co., Philadelphia and New York
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