1. Les chitinozoaires de la zone à Dicellograptus complanatus Formation de Vauréal, Ordovicien supérieur, Ile d’Anticosti, Québec;Achab;Canadian Journal of Earth Sciences,1977
2. Chitinozoaires du Caradoc supérieur – Ashgill inférieur du Québec, Canada;Achab;Canadian Journal of Earth Sciences,1987
3. Ordovician chitinozoans from the Arctic Platform and the Franklinian miogeosyncline in northern Canada;Achab;Review Palaeobotany and Palynology,1995
4. The Ordovician chitinozoan biodiversification and its leading factors;Achab;Palaeogeography, Palaeoclimatology, Palaeoecology,2007
5. Systematics and Biostratigraphy of the Middle Ordovician to Lower Silurian Chitinozoans of the Tabuk and Qasim Areas of the Arabian Peninsula;Al-Hajri,1991