Kim, S. & Paik, W.K. (1970). „Purification and properties of protein methylase II”. J. Biol. Chem. 245: 1806—1813. PMID5438363.
Ota, I.M., Ding, L. and Clarke, S. (1987). „Methylation at specific altered aspartyl and asparaginyl residues in glucagon by the erythrocyte protein carboxyl methyltransferase”. J. Biol. Chem. 262: 8522—8531. PMID3597386.CS1 одржавање: Вишеструка имена: списак аутора (веза)