APA

Kokal S., Al-Dawood N. & Society of Petroleum Engineers S. (2003). Productivity decline in oil wells related to asphaltene precipitation and emulsion blocks. [s.l]: Society of Petroleum Engineers, SPE.

Chicago

Kokal Sunil, Al-Dawood Naseem and Society of Petroleum Engineers SPE. 2003. Productivity decline in oil wells related to asphaltene precipitation and emulsion blocks. [s.l]: Society of Petroleum Engineers, SPE.

Harvard

Kokal S., Al-Dawood N. and Society of Petroleum Engineers S. (2003). Productivity decline in oil wells related to asphaltene precipitation and emulsion blocks. [s.l]: Society of Petroleum Engineers, SPE.

MLA

Kokal Sunil, Al-Dawood Naseem and Society of Petroleum Engineers SPE. Productivity decline in oil wells related to asphaltene precipitation and emulsion blocks. [s.l]: Society of Petroleum Engineers, SPE. 2003.