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William Kennedy and William Cobban (1999)

Pachydiscus (Pachydiscus) hornbyense Jones, 1963, and P. (P) Catarinae (Anderson & Hanna, 1935) (Cretaceous, Campanian : Ammonoidea), Pacific Realm marker fossils in the Western Interior Seaway of North America.

Bulletin de l'Institut Royal des Sciences Naturelles de Belgique - Bulletin van het Koninklijk Belgisch Instituut voor Natuurwetenschappen, 69 (Supplément A):119-127.