Rogers, G. E.; Rothnagel, J. A. (1983). “A sensitive assay for the enzyme activity in hair follicles and epidermis that catalyses the peptidyl-arginine-citrulline post-translational modification”. 《Current Problems in Dermatology》 11: 171–184. PMID6653155.
“Citrulline - Compound Summary”. 《PubChem Compound》. USA: National Center for Biotechnology Information. 2004년 9월 16일. Identification. 2012년 5월 1일에 확인함.