Anderson, L.C.; Kyhos, D.W.; Mosquin, T.; Powell, A.M.; Raven, P.H. 1974. Chromosome numbers in Compositae. IX. Haplopappus and other Astereae. American Journal of Botany. 61(6): 665-671.

Anderson, L.C.; Kyhos, D.W.; Mosquin, T.; Powell, A.M.; Raven, P.H. 1974. Chromosome numbers in Compositae. IX. Haplopappus and other Astereae. American Journal of Botany. 61(6): 665-671.