James, S. A.; Keenan, N. L.; Strogatz, D. S.; Browning, S. R.; Garrett, J. M. (1992). "Socioeconomic status, John Henryism, and blood pressure in black adults. The Pitt County Study". American Journal of Epidemiology. 135 (1): 59–67. doi:10.1093/oxfordjournals.aje.a116202. PMID1736661.
James, S. A.; Keenan, N. L.; Strogatz, D. S.; Browning, S. R.; Garrett, J. M. (1992). "Socioeconomic status, John Henryism, and blood pressure in black adults. The Pitt County Study". American Journal of Epidemiology. 135 (1): 59–67. doi:10.1093/oxfordjournals.aje.a116202. PMID1736661.