Tozer, Edward T. (1979). "The significance of the ammonoids Paratirolites and Otoceras in correlating the Permian–Triassic boundary beds of Iran and the People's Republic of China". Canadian Journal of Earth Sciences. 16 (7): 79–139. doi:10.1139/e79-139.
Korn, Dieter; Ghaderi, Abbas; Leda, Lucyna; Schobben, Martin; Ashouri, Ali Reza (2016). "The ammonoids from the Late Permian Paratirolites Limestone of Julfa (East Azerbaijan, Iran)". Journal of Systematic Palaeontology. 14 (10): 841–890. Bibcode:2016JSPal..14..841K. doi:10.1080/14772019.2015.1119211. S2CID130932875.
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Korn, Dieter; Ghaderi, Abbas; Leda, Lucyna; Schobben, Martin; Ashouri, Ali Reza (2016). "The ammonoids from the Late Permian Paratirolites Limestone of Julfa (East Azerbaijan, Iran)". Journal of Systematic Palaeontology. 14 (10): 841–890. Bibcode:2016JSPal..14..841K. doi:10.1080/14772019.2015.1119211. S2CID130932875.
Korn, Dieter; Ghaderi, Abbas; Leda, Lucyna; Schobben, Martin; Ashouri, Ali Reza (2016). "The ammonoids from the Late Permian Paratirolites Limestone of Julfa (East Azerbaijan, Iran)". Journal of Systematic Palaeontology. 14 (10): 841–890. Bibcode:2016JSPal..14..841K. doi:10.1080/14772019.2015.1119211. S2CID130932875.