Soreng, Robert J., Bull, Roger D., and Gillespie, Lynn J. 2010. "Phylogeny and reticulation in Poa based on plastid trnTLF and nrITS sequences with attention to diploids." in Diversity, Phylogeny, and Evolution in the Monocotyledons, edited by Seberg, O., Peterson, G., Barfod, A., and Davis, J. I., 619–643. Aarhus: Aarhus University Press.