RYAN, M.J.; EVANS, D.C.; SHEPHERD, K.M. (2012). «A new ceratopsid from the Foremost Formation (middle Campanian) of Alberta». Canadian Journal of Earth Sciences. 49 (11): 1251–1262. doi:10.1139/e2012-056
Ryan, M. J.; Russell, A. P. (2005). «A new centrosaurine ceratopsid from the Oldman Formation of Alberta and its implications for centrosaurine taxonomy and systematics». Canadian Journal of Earth Sciences. 42 (7). 1369 páginas. Bibcode:2005CaJES..42.1369R. doi:10.1139/e05-029. hdl:1880/47001
Ryan, M.J.; Holmes, R.; Mallon, J.; Loewen, M.; Evans, D.C. (2017). «A basal ceratopsid (Centrosaurinae: Nasutoceratopsini) from the Oldman Formation (Campanian) of Alberta, Canada». Canadian Journal of Earth Sciences. 54 (1): 1–14. Bibcode:2017CaJES..54....1R. doi:10.1139/cjes-2016-0110
Kentaro Chiba; Michael J. Ryan; Federico Fanti; Mark A. Loewen; David C. Evans (2018). «New material and systematic re-evaluation of Medusaceratops lokii (Dinosauria, Ceratopsidae) from the Judith River Formation (Campanian, Montana)». Journal of Paleontology. in press (2): 272–288. doi:10.1017/jpa.2017.62
Ryan, M. J.; Russell, A. P. (2005). «A new centrosaurine ceratopsid from the Oldman Formation of Alberta and its implications for centrosaurine taxonomy and systematics». Canadian Journal of Earth Sciences. 42 (7). 1369 páginas. Bibcode:2005CaJES..42.1369R. doi:10.1139/e05-029. hdl:1880/47001
Ryan, M. J.; Russell, A. P. (2005). «A new centrosaurine ceratopsid from the Oldman Formation of Alberta and its implications for centrosaurine taxonomy and systematics». Canadian Journal of Earth Sciences. 42 (7). 1369 páginas. Bibcode:2005CaJES..42.1369R. doi:10.1139/e05-029. hdl:1880/47001
Ryan, M.J.; Holmes, R.; Mallon, J.; Loewen, M.; Evans, D.C. (2017). «A basal ceratopsid (Centrosaurinae: Nasutoceratopsini) from the Oldman Formation (Campanian) of Alberta, Canada». Canadian Journal of Earth Sciences. 54 (1): 1–14. Bibcode:2017CaJES..54....1R. doi:10.1139/cjes-2016-0110