Loflin, Brian; Shirley Loflin (2009). Texas Cacti. Texas A&M University Press. p. 207. ISBN978-1-60344-108-7. Archived from the original on 12 December 2023. Retrieved 17 October 2016.
Blair, Andrew W.; Williamson, Paula S. (December 2008). "Effectiveness and Importance of Pollinators to the Star Cactus (Astrophytum asterias)". The Southwestern Naturalist. 53 (4): 423–430. doi:10.1894/JB-04.1. S2CID85845544.
Blair, Andrew W.; Williamson, Paula S. (December 2008). "Effectiveness and Importance of Pollinators to the Star Cactus (Astrophytum asterias)". The Southwestern Naturalist. 53 (4): 423–430. doi:10.1894/JB-04.1. S2CID85845544.
Loflin, Brian; Shirley Loflin (2009). Texas Cacti. Texas A&M University Press. p. 207. ISBN978-1-60344-108-7. Archived from the original on 12 December 2023. Retrieved 17 October 2016.