Kitamura N., Tanimoto A., Hondo E., Andrén A., Cottrell D.F., Sasaki M., Yamada J. (Αύγουστος 2001). «Immunohistochemical study of the ontogeny of prochymosin--and pepsinogen-producing cells in the abomasum of sheep». Anatomia, Histologia, Embryologia30 (4): 231-235. doi:10.1046/j.1439-0264.2001.00326.x. PMID11534329.
Henschel M.J., Newport M.J., Parmar V. (1987). «Gastric proteases in the human infant». Biology of the Neonate52 (5): 268-272. doi:10.1159/000242719. PMID3118972.
Gilliland G.L., Oliva M.T., Dill J. (1991). «Functional implications of the three-dimensional structure of bovine chymosin». Advances in Experimental Medicine and Biology306: 23-37. doi:10.1007/978-1-4684-6012-4_3. ISBN978-1-4684-6014-8. PMID1812710.
Kitamura N., Tanimoto A., Hondo E., Andrén A., Cottrell D.F., Sasaki M., Yamada J. (Αύγουστος 2001). «Immunohistochemical study of the ontogeny of prochymosin--and pepsinogen-producing cells in the abomasum of sheep». Anatomia, Histologia, Embryologia30 (4): 231-235. doi:10.1046/j.1439-0264.2001.00326.x. PMID11534329.
Henschel M.J., Newport M.J., Parmar V. (1987). «Gastric proteases in the human infant». Biology of the Neonate52 (5): 268-272. doi:10.1159/000242719. PMID3118972.
Gilliland G.L., Oliva M.T., Dill J. (1991). «Functional implications of the three-dimensional structure of bovine chymosin». Advances in Experimental Medicine and Biology306: 23-37. doi:10.1007/978-1-4684-6012-4_3. ISBN978-1-4684-6014-8. PMID1812710.