New Middle and Late Anisian (Middle Triassic) Ammonoid Faunas from Northwestern Nevada (USA) Taxonomy and Biochronology, Proceedings of the 5th International Brachiopod Conference Monnet C. Heftet / 2007 / Engelsk
Smithian (Early Triassic) ammonoid faunas from northwestern Guangxi (South China) Taxonomy and Biochronology Brayard Arnaud Heftet / 2008 / Engelsk
Special Papers in Palaeontology, Smithian (Early Triassic) ammonoids from the Salt Range (Pakistan) and Spiti (India) Brühwiler, Thomas Heftet / 2012 / Engelsk
