Camelback rapid transit corridor study, 1988: t.p. (Regional Public Transportation Authority) p. 2 (Phoenix Regional Public Transportation Authority (RPTA))

Transit on the move, 1997: p. 2 (The RPTA is a political subdivision of Arizona overseen by a ten-member board of elected officials, and was created by voters in 1985. Membership is open to all municipalities in Maricopa County and to the County government.)

OCLC, Feb. 8, 2001 (hdg.: Regional Public Transportation Authority (Pheonix, Ariz.); Maricopa County (Ariz.). Regional Public Transportation Authority; usage: Regional Public Transportation Authority; Regional Public Transportation Authority, Maricopa County, Arizona)

Phone call to RPTA, Feb. 8, 2001 (RPTA has never been a part of the Maricopa County government)

Valley Metro Transit Library index, 2003: t.p. (Valley Metro); Valley Metro WWW home page, Dec. 19, 2003: (In January 2002, the Regional Public Transportation Authority officially changed its name to Valley Metro) ; 36 ways to get around the Valley, 1977?: map recto (Phoenix Transit System)