AU  - PORTER WT
TI  - THe critical periods in the life of a physician
PT  - JOUR
DP  - 1909
TA  - Journal of the American Medical Association
pages = {1305-1307},
VI  - LII
IP  - 17
AID  - 10.1001/jama.1909.25420430001001 [doi]
4100  - http://dx.doi.org/10.1001/jama.1909.25420430001001
SO  - Journal of the American Medical Association April 24, 1909 LII(17):1305