Weiss, Emilio; Strauss, Bernard S. (27 December 1990) [1991], "The Life and Career of Howard Taylor Ricketts", Reviews of Infectious Diseases, 13 (6), The University of Chicago: 1241–2, doi:10.1093/clinids/13.6.1241, PMID1775858
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pubmed.ncbi.nlm.nih.gov
Weiss, Emilio; Strauss, Bernard S. (27 December 1990) [1991], "The Life and Career of Howard Taylor Ricketts", Reviews of Infectious Diseases, 13 (6), The University of Chicago: 1241–2, doi:10.1093/clinids/13.6.1241, PMID1775858