Evan E. Bolton; Yanli Wang; Paul A. Thiessen; Stephen H. Bryant (2008). „Chapter 12 PubChem: Integrated Platform of Small Molecules and Biological Activities”. Annual Reports in Computational Chemistry. 4: 217—241. doi:10.1016/S1574-1400(08)00012-1.
Podell David N., Abraham George N. (1978), „A technique for the removal of pyroglutamic acid from the amino terminus of proteins using calf liver pyroglutamate amino peptidase”, Biochem. Biophys. Res. Commun., 81 (1): 176—85, PMID26343, doi:10.1016/0006-291X(78)91646-7.
Podell David N., Abraham George N. (1978), „A technique for the removal of pyroglutamic acid from the amino terminus of proteins using calf liver pyroglutamate amino peptidase”, Biochem. Biophys. Res. Commun., 81 (1): 176—85, PMID26343, doi:10.1016/0006-291X(78)91646-7.