For Krigia
Chambers, K.L. 2004. Taxonomic notes on Krigia (Asteraceae). Sida 21: 225-236.
Chambers, K.L., and R.J. O'Kennon. 2006. Krigia. In Flora of North America Editorial Committee. 2006a. Flora of North America north of Mexico. Volume 19, Magnoliophyta: Asteridae, part 6: Asteraceae, part 1. Oxford Univ. Press, New York, NY. 579 pp.
Cronquist, A. 1980. Asteraceae, Volume I, Vascular flora of the Southeastern United States. University of North Carolina Press, Chapel Hill, N.C.
Kim, K.-J., and B.L. Turner. 1992. Systematic overview of Krigia (Asteraceae - Lactuceae). Brittonia 44: 173-198.