Tubeza, P. C. PH has options on joint sea exploration, says palace. Philippine Daily Inquirer.
Chicago-viite (17. p.)Tubeza, Philip C. "PH Has Options on Joint Sea Exploration, Says Palace." Philippine Daily Inquirer .
MLA-viite (9. p.)Tubeza, Philip C. "PH Has Options on Joint Sea Exploration, Says Palace." Philippine Daily Inquirer, .
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