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  1. The ammonoid fauna of the Kimmeridgian-Tithonian boundary beds of Mombasa, Kenya /
    By: Verma, Harish M. - Westermann, Gerd Ernst Gerold,
    Publication info: Toronto, Canada :ROM,1984.
    Contributed by: ROM - University of Toronto (archive.org)
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  2. Form, structure and function of shell and siphuncle in coiled Mesozoic ammonoids /
    By: Westermann, Gerd Ernst Gerold,
    Publication info: [Toronto] :Royal Ontario Museum,1971.
    Contributed by: ROM - University of Toronto (archive.org)
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