found: NUCMC data from Rutgers Univ. Libr. for New Democratic Coalition of New York. Records, 1960-1978(I. Philip Sipser)
found: Bio. Indx.,v. 10 (Sipser, I. Philip, 1918- ; lawyer)
found: NY Times, July 11, 1983(I. Philip Sipser, lawyer, representing musicians for 16 years)
found: New York Times, Apr. 5, 2001(I. Philip Sipser, 82, political activist and labor lawyer for musicians in New York City; d. Mar. 31, 2001, New York City; b. Isidore Philip Sipser in 1918, Manhattan)
notfound: Who's Who Amer, 1974-75, 1987-88;Who's Who Amer. Law, 1977-79;Amer. Bar, 1988.