N.H.Holmgren & S.Kelso (N.H.Holmgren) 2001 - Holmgren NH, Kelso S (2001) Primula cusickiana (Primulaceae) and its varieties. Brittonia 53(1): 154-156. doi: 10.1007/bf02805407.
There is no corrections for Primula cusickiana var. nevadensis yet.