Tanabe, K., Y. Hikida & Y. Iba (2006). Two coleoid jaws from the Upper Cretaceous of Hokkaido, Japan. Journal of Paleontology80(1): 138–145. DOI:[0138:TCJFTU2.0.CO;2 10.1666/0022-3360(2006)080[0138:TCJFTU]2.0.CO;2]
Zakharov, Y.D. & T.A. Lominadze (1983). New data on the jaw apparatus of fossil cephalopods. Lethaia16(1): 67–78. DOI:10.1111/j.1502-3931.1983.tb02000.x
Tanabe, K., P. Trask, R. Ross & Y. Hikida (2008). Late Cretaceous octobrachiate coleoid lower jaws from the north Pacific regions. Journal of Paleontology82(2): 398–408. DOI:10.1666/07-029.1
Klug, C., G. Schweigert, D. Fuchs & G. Dietl (2010). First record of a belemnite preserved with beaks, arms and ink sac from the Nusplingen Lithographic Limestone (Kimmeridgian, SW Germany). Lethaia43(4): 445–456. DOI:10.1111/j.1502-3931.2009.00203.x
Tanabe, K. (2012). Comparative morphology of modern and fossil coleoid jaw apparatuses. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen266(1): 9–18. DOI:10.1127/0077-7749/2012/0243
Morton, N. & M. Nixon (1987). Size and function of ammonite aptychi in comparison with buccal masses of modem cephalopods. Lethaia20(3): 231–238. DOI:10.1111/j.1502-3931.1987.tb02043.x
Lehmann, U. & C. Kulicki (1990). Double function of aptychi (Ammonoidea) as jaw elements and opercula. Lethaia23: 325–331. DOI:10.1111/j.1502-3931.1990.tb01365.x
Seilacher, A. (1993). Ammonite aptychi; how to transform a jaw into an operculum? American Journal of Science293: 20–32. DOI:10.2475/ajs.293.A.20
