Edsall JT & Wyman J, 1958
John Edsall and Jeffries Wyman report a nearly complete set of amino acid pK values in their 1958 text Biophysical Chemistry (1). The values they report are drawn from various sources, but largely depend on data published earlier by Cohen and Edsall (2). These data are based on measurements of free amino acids and short peptides.
Amino acid pK values from Edsall JT & Wyman J, 1958 (1).