Template:Cox & Urbatsch, 1994

• Cox, P.B. & Urbatsch, L.E. 1994. A Taxonomic Revision of Rudbeckia subg. Macrocline (Asteraceae: Heliantheae: Rudbeckiinae). Castanea; Journal of the Southern Appalachian Botanical Society 59(4): 300–318. JSTOR  
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