Knapp, Sandra (Autor Personal)

Psilotaceae a Salviniaceae, 1995: t.p. (Sandra Knapp)

OCLC, Apr. 26, 2004 (hdg.: Knapp, Sandra Diane; usage: Sandra Diane Knapp; author's Ph. D. thesis, Cornell Univ., 1986)

Beyond cladistics, 2010: ECIP t.p. (Sandra Knapp) data view (b. Dec. 9, 1956)

United Nations Environment Programme website, viewed March 31, 2010 (Dr.; Sandra Knapp; Dept. of Botany, came to the Natural History Museum, London, in 1992; studies plants of Central America, etc.)

Wikipedia, the free encyclopedia, June 30, 2020: Sandra Knapp (Sandra Diane Knapp FLS [Fellow of the Linnaean Society]; born 1965; American-born botranist; currently president of the Linnaean Society and a merit researcher of the Plants Division of the Natural History Museum, London; awarded the Linnean Medal in 2016) https://en.wikipedia.org/wiki/Sandra_Knapp