^Krenitsky, T.A., Neil, S.M. and Miller, R.L. (1970). „Guanine and xanthine phosphoribosyltransfer activities of Lactobacillus casei and Escherichia coli. Their relationship to hypoxanthine and adenine phosphoribosyltransfer activities”. J. Biol. Chem. 245: 2605—2611. PMID4910918.CS1 održavanje: Višestruka imena: spisak autora (veza)