For Beta
Judd, W.S., and I.K. Ferguson. 1999. The genera of Chenopodiaceae in the southeastern United States. Harvard Papers in Botany 4: 365-416.
Kühn. 1993. In Kubitzki, K., J.G. Rohwer, and V. Bittrich, eds. 1993. The families and genera of vascular plants. II. Flowering plants – Dicotyledons – Magnoliid, Hamamelid and Caryophyllid families. Springer, Berlin. 653 pp.
Romeiras, M.M., A. Vieira, D.N. Silva, M. Moura, A. Santos-Guerra, D. Batista, M.C. Duarte, and O.S. Paulo. 2016. Evolutionary and biogeographic insights on the Macaronesian Beta-Patellifolia species (Amaranthaceae) from a time-scaled molecular phylogeny. PLoS ONE 11(3): e0152456. doi:10.1371/ journal.pone.0152456
Schultz, L.A. 2003b. Beta. In Flora of North America Editorial Committee. 2003b. Flora of North America north of Mexico. Volume 4, Magnoliophyta: Caryophyllidae, part 1. Oxford Univ. Press, New York, NY. 559 pp.
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