Westbroek, P. (1967). Morphological observations with systematic implications on some Palaeozoic Rhynchonellida from Europe, with special emphasis on the Uncinulidae.
Chicago-referens (17:e uppl.)Westbroek, P. Morphological Observations with Systematic Implications on Some Palaeozoic Rhynchonellida from Europe, with Special Emphasis on the Uncinulidae. 1967.
MLA-referens (8:e uppl.)Westbroek, P. Morphological Observations with Systematic Implications on Some Palaeozoic Rhynchonellida from Europe, with Special Emphasis on the Uncinulidae. 1967.
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