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Pigg, K.B.; DeVore, M.L. (2005). "Shirleya grahamae gen. et sp. nov.(Lythraceae), Lagerstroemia-like fruits from the middle Miocene Yakima Canyon flora, central Washington State, USA". American Journal of Botany. 92 (2): 242–251. doi:10.3732/ajb.92.2.242. PMID21652401.
Pigg, K.B.; DeVore, M.L. (2005). "Shirleya grahamae gen. et sp. nov.(Lythraceae), Lagerstroemia-like fruits from the middle Miocene Yakima Canyon flora, central Washington State, USA". American Journal of Botany. 92 (2): 242–251. doi:10.3732/ajb.92.2.242. PMID21652401.