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Matthew JB, 1985
Matthew reports a complete set of pK values in his review paper titled "Electrostatic effects in proteins" (1). The pK values are reported as the "commonly quoted" intrinsic pK values.
Amino acid pK values from Matthew JB, 1985 (1).
Group
pK   
CT
3.60
 
ASP
4.00
 
GLU
4.5
   
HIS
6.4
   
NT
8.0
   
CYS
9.00
 
TYR
10.0
   
LYS
10.4
   
ARG
12.0
   
†  Data from p. 390.
References
(1)  Matthew JB (1985) Electrostatic effects in proteins. Annu Rev Biophys Biophys chem. 14:387-417.