Asa Gray: Perbedaan antara revisi

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* {{cite letter|ref=harv |first=Charles |last=Darwin |recipient=Asa Gray |subject=Letter 13031, Darwin Correspondence Project |date=29 Januari 1881 |url=http://www.darwinproject.ac.uk/entry-13031 |accessdate=January 1, 2015}}
* {{cite book|ref = harv|last=Darwin|first=Charles|editor-last=Darwin|editor-first=Francis|title=The Life and Letters of Charles Darwin|year=1888|publisher=John Murray, Albemarle Street|location=London|url=https://books.google.com/books?id=9yESAAAAYAAJ&pg=PA60}}
* {{cite journal|ref=harv|last=Deane|first=Walter|title=Asa Gray|url=http://botlib.huh.harvard.edu/libraries/Gray_Bicent/graybio.htm|journal=Bulletin of the Torrey Botanical Club|volume=XV|issue=3|year=1888|jstor=2476862|access-date=2015-12-24|archive-date=2014-11-10|archive-url=https://web.archive.org/web/20141110221013/http://botlib.huh.harvard.edu/libraries/Gray_Bicent/graybio.htm|dead-url=yes}}
* {{cite book|ref = harv|last=Donnelly|first=Walter A.|title=The University of Michigan: An Encyclopedic Survey, Pt 8|year=1958|publisher=University of Michigan Press|location=Ann Arbor, MI|url=https://books.google.com/books?id=7WBqAAAAMAAJ&pg=PA1369}}
* {{cite book|ref=harv|last=Dupree|first=A. Hunter|year=1988|title=Asa Gray, American Botanist, Friend of Darwin|publisher=Johns Hopkins University Press|location=Baltimore, MD|isbn=978-0-801-83741-8}}