Kulwadee Lawwongngam. 1990. Biological markers for geochemical correlation of crude oils from Sirikit Oilfield, Phitsanulok Basin. Bangkok:Chulalongkorn University;
Kulwadee Lawwongngam. (1990) Biological markers for geochemical correlation of crude oils from Sirikit Oilfield, Phitsanulok Basin (รายงานผลงานวิจัย). Chulalongkorn University:Bangkok.
Kulwadee Lawwongngam. Biological markers for geochemical correlation of crude oils from Sirikit Oilfield, Phitsanulok Basin. Bangkok:Chulalongkorn University, 1990.
Kulwadee Lawwongngam. (1990) Biological markers for geochemical correlation of crude oils from Sirikit Oilfield, Phitsanulok Basin (รายงานผลงานวิจัย). Chulalongkorn University:Bangkok.