Ferling, John. John Adams: A Life. Knoxville: The University of Tennessee Press, 1992, 535 p.
Comprehensive biography of Adams.
Ferling, John and Lewis E. Braverman. “John Adams's Health Reconsidered.” William and Mary Quarterly 55, No. 1 (January 1998): 83-104.
Examines the recurring health problems of the second president and attempts to account for some of the contemporary rumors and accusations that Adams was mentally unbalanced.
Shaw, Peter. The Character of John Adams. Chapel Hill: University of North Carolina Press, 1976, 324 p.
(The entire section is 532 words.)