(1998). An act granting the General Telephone System, Inc., a franchise to construct, establish, install, maintain and operate local exchange network in the provinces of Quezon, Batangas and Laguna ; municipalities of Panacao, Libmanan and Cabusao . Manila Times.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र"An Act Granting the General Telephone System, Inc., a Franchise to Construct, Establish, Install, Maintain and Operate Local Exchange Network in the Provinces of Quezon, Batangas and Laguna ; Municipalities of Panacao, Libmanan and Cabusao ." Manila Times 1998.
एमएलए (9वां संस्करण) प्रशस्ति पत्र"An Act Granting the General Telephone System, Inc., a Franchise to Construct, Establish, Install, Maintain and Operate Local Exchange Network in the Provinces of Quezon, Batangas and Laguna ; Municipalities of Panacao, Libmanan and Cabusao ." Manila Times, 1998.