found: Author's A selected list of music for men's voices, 1952.
found: His George Frideric Handel's chamber duets, 1987:CIP t.p. (J. Merrill Knapp) data sheet (b. 5-9-14)
found: Dean, W. Handel's operas, 1704-1726, 1986:CIP t.p. (John Merrill Knapp) pub. info. sheet (emeritus prof. of music, Princeton Univ.)
found: New Grove(Knapp, J(ohn) Merrill)
found: His Amadigi, 1985:t.p. (Merrill Knapp)
found: Dean, W. Handel's operas, 1704-1726, 1994:CIP t.p. (John Merrill Knapp) new book announcement (d. 1993)
found: Wikipedia, viewed 2 June 2018(J. Merrill Knapp; John Merrill Knapp (May 9, 1914--March 7, 1993) was an American musicologist and academic; he was considered an authority on the life and works of George Frideric Handel; he was born in New York City and died at Princeton Medical Center)
