DITTMER, H. J. (1964). Phylogeny In The Plant Kingdom / Howard J.dittmer. D.Van Nostrand Company.
Lua i Stíl Chicago (17ú heag.)DITTMER, Howard J. Phylogeny In The Plant Kingdom / Howard J.dittmer. D.Van Nostrand Company, 1964.
Lua MLA (8ú heag.)DITTMER, Howard J. Phylogeny In The Plant Kingdom / Howard J.dittmer. D.Van Nostrand Company, 1964.
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