Martínez-Fernández, L. El Partido Nuevo Progresista, between 1985 and 1987: t.p. (Partido Nuevo Progresista) p. 2 (PNP) 8th prel. p., etc. (Emerged during the political campaign of 1967-1968 in Puerto Rico)

Statesman's yrbk., 1986-87: p. 1558, under Puerto Rico (New Progressive Party)

Pol. handbk. of the world, 1986, p. 603 (New Progressive Party (Partido Nuevo Progresista--PNP))