APA

Ulmishek G. F., Magoon L. B., Geological Survey, World Petroleum Congress (14th : 1994 : Stavanger), Magoon L. B. & Geological Survey.The petroleum system -concept and applications. : .

Chicago

Ulmishek Gregory F, Magoon Leslie B, Geological Survey, World Petroleum Congress (14th : 1994 : Stavanger), Magoon Leslie B and Geological Survey.The petroleum system -concept and applications. : .

Harvard

Ulmishek G. F., Magoon L. B., Geological Survey, World Petroleum Congress (14th : 1994 : Stavanger), Magoon L. B. and Geological Survey.The petroleum system -concept and applications. : .

MLA

Ulmishek Gregory F, Magoon Leslie B, Geological Survey, World Petroleum Congress (14th : 1994 : Stavanger), Magoon Leslie B and Geological Survey.: . .