Frey MN, Koetzle TF, Lehmann MS, Hamilton WC (1973). "Precision neutron diffraction structure determination of protein and nucleic acid components. X. A comparison between the crystal and molecular structures of L‐tyrosine and L‐tyrosine hydrochloride". J. Chem. Phys.58 (6): 2547–2556. Bibcode:1973JChPh..58.2547F. doi:10.1063/1.1679537.
etymonline.com
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harvard.edu
ui.adsabs.harvard.edu
Frey MN, Koetzle TF, Lehmann MS, Hamilton WC (1973). "Precision neutron diffraction structure determination of protein and nucleic acid components. X. A comparison between the crystal and molecular structures of L‐tyrosine and L‐tyrosine hydrochloride". J. Chem. Phys.58 (6): 2547–2556. Bibcode:1973JChPh..58.2547F. doi:10.1063/1.1679537.
infoplease.com
"Tyrosine". The Columbia Electronic Encyclopedia, 6th ed. Infoplease.com — Columbia University Press. 2007. Dicapai pada 2008-04-20.