APA

Ofurhie M., Okpere K., World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro B. & Okpere K.Nigeria deep offshore. : .

Chicago

Ofurhie Mac, Okpere Kisito, World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro Brasil) and Okpere Kisito.Nigeria deep offshore. : .

Harvard

Ofurhie M., Okpere K., World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro B. and Okpere K.Nigeria deep offshore. : .

MLA

Ofurhie Mac, Okpere Kisito, World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro Brasil) and Okpere Kisito.: . .