Christensen, W. K., & Schmid, F. (1987). The Belemnites of the Vaals Formation from the C.P.L. Quarry at Hallembaye/Belgium: Taxonomy, biometry and biostratigraphy. Bundesanstalt für Geowissenschaften und Rohstoffe; Schweizerbart.
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Tohutoru Kātū Chicago (17th ed.)
Christensen, Walter Kegel, me Friedrich Schmid. The Belemnites of the Vaals Formation from the C.P.L. Quarry at Hallembaye/Belgium: Taxonomy, Biometry and Biostratigraphy. Hannover; Stuttgart: Bundesanstalt für Geowissenschaften und Rohstoffe; Schweizerbart, 1987.
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Tohutoro MLA (9th ed.)
Christensen, Walter Kegel, me Friedrich Schmid. The Belemnites of the Vaals Formation from the C.P.L. Quarry at Hallembaye/Belgium: Taxonomy, Biometry and Biostratigraphy. Bundesanstalt für Geowissenschaften und Rohstoffe; Schweizerbart, 1987.
I tāruatia paitia ki te papatopenga
Kua rahua te tārua ki te papatopenga
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