Clarence Prestwich et Ruth Book, « A Comparison of Standards: USDA-Natural Resources Conservation Service and ASABE », 2021 ASABE Annual International Virtual Meeting, July 12-16, 2021, American Society of Agricultural and Biological Engineers, (DOI10.13031/aim.202100041, lire en ligne, consulté le )
Nancy R. Morin, « New Publication: Flora of North America North of Mexico, Volume 28: Bryophyta, Part 2.NEW PUBLICATION: Flora of North America north of Mexico, Volume 28: Bryophyta, Part 2. Flora of North America Editorial Committee, pp. US $95 (ISBN9780190202750). Oxford University Press, www.oup.com. August 2014. », Evansia, vol. 31, no 3, , p. 112–112 (ISSN0747-9859, DOI10.1639/079.031.0307, lire en ligne, consulté le )
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Nancy R. Morin, « New Publication: Flora of North America North of Mexico, Volume 28: Bryophyta, Part 2.NEW PUBLICATION: Flora of North America north of Mexico, Volume 28: Bryophyta, Part 2. Flora of North America Editorial Committee, pp. US $95 (ISBN9780190202750). Oxford University Press, www.oup.com. August 2014. », Evansia, vol. 31, no 3, , p. 112–112 (ISSN0747-9859, DOI10.1639/079.031.0307, lire en ligne, consulté le )