Prawpring Chaiprasert. 1999. One-step catalytic hydrotreatment of used automotive lubricating oil. Program of Petrochemistry and Polymer Science, Chulalongkorn University;
Prawpring Chaiprasert. (1999) One-step catalytic hydrotreatment of used automotive lubricating oil . Chulalongkorn University/Bangkok.
Prawpring Chaiprasert. One-step catalytic hydrotreatment of used automotive lubricating oil. . Bangkok:Chulalongkorn University, 1999.
Prawpring Chaiprasert. (1999) One-step catalytic hydrotreatment of used automotive lubricating oil . Chulalongkorn University/Bangkok.