R.H.A. Plimmer (1912) [1908]. R.H.A. Plimmer; F.G. Hopkins (eds.). The chemical composition of the proteins. Monographs on biochemistry. Vol. Part I. Analysis (2nd ed.). London: Longmans, Green and Co. p. 132. Retrieved January 18, 2010.
Bella, J; Eaton, M; Brodsky, B; Berman, HM (1994). "Crystal and molecular structure of a collagen-like peptide at 1.9 A resolution". Science. 266 (5182): 75–81. doi:10.1126/science.7695699. PMID7695699.
Bella, J; Eaton, M; Brodsky, B; Berman, HM (1994). "Crystal and molecular structure of a collagen-like peptide at 1.9 A resolution". Science. 266 (5182): 75–81. doi:10.1126/science.7695699. PMID7695699.