Kennedy, W., Cobban, W., Elder, W., & Kirkland, J. (1999). Lower Turonian (Upper Cretaceous) Watinoceras devonense Zone ammonite fauna in Colorado, USA.
Style de citation Chicago (17e éd.)Kennedy, W., W. Cobban, W. Elder, et J. Kirkland. Lower Turonian (Upper Cretaceous) Watinoceras Devonense Zone Ammonite Fauna in Colorado, USA. 1999.
Style de citation MLA (9e éd.)Kennedy, W., et al. Lower Turonian (Upper Cretaceous) Watinoceras Devonense Zone Ammonite Fauna in Colorado, USA. 1999.
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