For Aphanostephus
Nesom, G.L. 2006cc. Aphanostephus. In Flora of North America Editorial Committee. 2006b. Flora of North America north of Mexico. Volume 20, Magnoliophyta: Asteridae, part 6: Asteraceae, part 2. Oxford Univ. Press, New York, NY. 666 pp.
Nesom, G.L. 2008b. Classification of subtribe Conyzinae (Asteraceae: Astereae). Lundellia 11: 8-38.
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