Template:Ref-Fawcett1917
From Embryology
Fawcett E. Paper - The primordial cranium of microtus amphibius (water-rat), as determined by sections and a model of the 25-mm stage (1917)|The primordial cranium of microtus amphibius (water-rat), as determined by sections and a model of the 25-mm. stage. with comparative remarks]]. (1917) J Anat. 51(4): 309-359. PMID 17103821