Gentry, H. S. (1942). Rio Mayo plants: A study of the flora and vegetation of the valley of Rio Mayo. Carnegie Institution of Washington Publication.
Chicago-referens (17:e uppl.)Gentry, Howard Scott. Rio Mayo Plants: A Study of the Flora and Vegetation of the Valley of Rio Mayo. Washington D.C: Carnegie Institution of Washington Publication, 1942.
MLA-referens (9:e uppl.)Gentry, Howard Scott. Rio Mayo Plants: A Study of the Flora and Vegetation of the Valley of Rio Mayo. Carnegie Institution of Washington Publication, 1942.
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