Kuo M, Dewsbury DR, O'Donnell K, Carter MC, Rehner SA, Moore JD, Moncalvo J-M, Canfield SA, Stephenson SL, Methven AS, Volk TJ. Taxonomic revision of true morels (Morchella) in Canada and the United States. Mycologia. 11 April 2012. doi:10.3852/11-375.
O'Donnell K, Rooney AP, Mills GL, Kuo M, Weber NS, Rehner SA. Phylogeny and historical biogeography of true morels (Morchella) reveals an early Cretaceous origin and high continental endemism and provincialism in the Holarctic. Fungal Genetics and Biology. Mar 2011, 48 (3): 252–265. PMID 20888422. doi:10.1016/j.fgb.2010.09.006.
O'Donnell K, Rooney AP, Mills GL, Kuo M, Weber NS, Rehner SA. Phylogeny and historical biogeography of true morels (Morchella) reveals an early Cretaceous origin and high continental endemism and provincialism in the Holarctic. Fungal Genetics and Biology. Mar 2011, 48 (3): 252–265. PMID 20888422. doi:10.1016/j.fgb.2010.09.006.