Green GA.
J Med Educ. 1966 Jul;41(7):705-6. doi: 10.1097/00001888-196607000-00009.
PMID: 5918838

Byrne PS, Knox JD.
J R Coll Gen Pract. 1970 Jan;19(90):44-9.
PMID: 5411264 Free PMC Article
Free PMC Article

Clarke R, Fentem P, Short T.
Med Educ. 1976 May;10(3):243.
PMID: 1268132

Manzar S.
Saudi Med J. 2001 Mar;22(3):283-4.
PMID: 11307121

[No authors listed]
Adv Health Sci Educ Theory Pract. 2005;10(2):85-8. doi: 10.1007/s10459-005-0465-y.
PMID: 16078093

Friedman MA, Hopwood LE, Moulder JE, Cox JD.
Med Teach. 1987;9(3):333-41. doi: 10.3109/01421598709034796.
PMID: 3683144

Macklin R, Jones J.
Hastings Cent Rep. 1983 Jun;13(3):23-5.
PMID: 6885397