Rogers، Fred B. (ديسمبر 1964). "Martha Tracy (1876–1942): Exceptional Woman of Public Health". Archives of Environmental Health: An International Journal. ج. 9 ع. 6: 819–821. DOI:10.1080/00039896.1964.10663931. PMID:14203108.
Rogers، Fred B. (ديسمبر 1964). "Martha Tracy (1876–1942): Exceptional Woman of Public Health". Archives of Environmental Health: An International Journal. ج. 9 ع. 6: 819–821. DOI:10.1080/00039896.1964.10663931. PMID:14203108.