APA
PTT Exploration and Production Public Company Limited, . (2007). Thai Heritage World Heritage. : PTT Exploration and Production.
Chicago
PTT Exploration and Production Public Company Limited, . 2007. Thai Heritage World Heritage. : PTT Exploration and Production.
Harvard
PTT Exploration and Production Public Company Limited, . (2007). Thai Heritage World Heritage. : PTT Exploration and Production.
MLA
PTT Exploration and Production Public Company Limited, . Thai Heritage World Heritage. : PTT Exploration and Production. 2007.
