Resan; Hammond (2000). "A Philadelphia Story-Featuring Ned Williams: Microbiology at the University of Pennsylvania School of Dental Medicine". Journal of Dental Research. 79 (7): 1451–1457. doi:10.1177/00220345000790070401. PMID11005727. S2CID8728858.
Resan; Hammond (2000). "A Philadelphia Story-Featuring Ned Williams: Microbiology at the University of Pennsylvania School of Dental Medicine". Journal of Dental Research. 79 (7): 1451–1457. doi:10.1177/00220345000790070401. PMID11005727. S2CID8728858.
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Resan; Hammond (2000). "A Philadelphia Story-Featuring Ned Williams: Microbiology at the University of Pennsylvania School of Dental Medicine". Journal of Dental Research. 79 (7): 1451–1457. doi:10.1177/00220345000790070401. PMID11005727. S2CID8728858.