(1998). An act granting the Calbayog Telecphone System, a franchise to construct, establish, install, maintain and operate local exchange network in the City of Calbayog, province of Samar. Manila Times.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र"An Act Granting the Calbayog Telecphone System, a Franchise to Construct, Establish, Install, Maintain and Operate Local Exchange Network in the City of Calbayog, Province of Samar." Manila Times 1998.
एमएलए (9वां संस्करण) प्रशस्ति पत्र"An Act Granting the Calbayog Telecphone System, a Franchise to Construct, Establish, Install, Maintain and Operate Local Exchange Network in the City of Calbayog, Province of Samar." Manila Times, 1998.
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