APA

Angulo L. F. D., Chelela J. F., Occidental de Colombia, World Petroleum Congress (14th : 1994 : Stavanger), Chelela J. F. & Occidental de Colombia.Balancing societal goals and oil development. : .

Chicago

Angulo Luis Fernando De, Chelela Jose Francisco, Occidental de Colombia, World Petroleum Congress (14th : 1994 : Stavanger), Chelela Jose Francisco and Occidental de Colombia.Balancing societal goals and oil development. : .

Harvard

Angulo L. F. D., Chelela J. F., Occidental de Colombia, World Petroleum Congress (14th : 1994 : Stavanger), Chelela J. F. and Occidental de Colombia.Balancing societal goals and oil development. : .

MLA

Angulo Luis Fernando De, Chelela Jose Francisco, Occidental de Colombia, World Petroleum Congress (14th : 1994 : Stavanger), Chelela Jose Francisco and Occidental de Colombia.: . .