Donahue & Lopez Upton 1999 - Donahue JK, Upton JL (1999) A NEW VARIETY OF PINUS GREGGII (PINACEAE) IN MEXICO. Sida, Contributions To Botany 18(4): 1083-1093. Retrieved from http://www.jstor.org/stable/41967722
There is no corrections for Pinus greggii var. australis yet.