From Wikipilipinas: The Hip 'n Free Philippine Encyclopedia
Jose Alejandrino was a former Senator to 7th Philippine Legislature (1925–1928) of the Twelfth Senatorial District of Mt. Province, Baguio, Nueva Vizcaya, Agusan, Bukidnon, Cotabato, Lanao, Sulu and Zamboanga.
- "Senatorial districts of the Philippines." http://en.wikipedia.org/wiki/Senatorial_districts_of_the_Philippines (July 13, 2007).