An difríocht idir athruithe ar: "Roy J. Plunkett"

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*Center for Oral History. "Roy J. Plunkett". Science History Institute.https://oh.sciencehistory.org/oral-histories/plunkett-roy-j
* Bohning, James J. (27 May 1986). Roy J. Plunkett, Transcripts of Interviews Conducted by James J. Bohning in New York City and Philadelphia on 14 April and 27 May 1986. https://oh.sciencehistory.org/sites/default/files/plunkett_rj_0037_suppl.pdf]
 
[[Catagóir:Básanna i 1994]]