(1998). An act granting the Trento Telephone System Incorporated a franchise to construct, establish, install, maintain, and operate local exchange network in the municipality of Trento, Province of Agusan Del Sur. Manila Times.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र"An Act Granting the Trento Telephone System Incorporated a Franchise to Construct, Establish, Install, Maintain, and Operate Local Exchange Network in the Municipality of Trento, Province of Agusan Del Sur." Manila Times 1998.
एमएलए (9वां संस्करण) प्रशस्ति पत्र"An Act Granting the Trento Telephone System Incorporated a Franchise to Construct, Establish, Install, Maintain, and Operate Local Exchange Network in the Municipality of Trento, Province of Agusan Del Sur." Manila Times, 1998.
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