Regalado, E. MGB stops nickel mining operation in Davao Oriental. The Philippine Star.
Chicago-viite (17. p.)Regalado, Edith. "MGB Stops Nickel Mining Operation in Davao Oriental." The Philippine Star .
MLA-viite (9. p.)Regalado, Edith. "MGB Stops Nickel Mining Operation in Davao Oriental." The Philippine Star, .
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.