Varker, W. J. (1967). Conodonts of the genus Apatognathus Branson and Mehl from the Yoredale Series of the north of England. Zenodo.
Chicago Style (17th ed.) CitationVarker, W. John. Conodonts of the Genus Apatognathus Branson and Mehl from the Yoredale Series of the North of England. Zenodo, 1967.
MLA (9th ed.) CitationVarker, W. John. Conodonts of the Genus Apatognathus Branson and Mehl from the Yoredale Series of the North of England. Zenodo, 1967.
Warning: These citations may not always be 100% accurate.