Pitchayatak Ponrod และ Ajchara Harnchoowong. (2016) Structure of unit groups of quotient rings of integers in Some cubic fields. Chulalongkorn University:ม.ป.ท.Pitchayatak Ponrod และ Ajchara Harnchoowong. 2016. Structure of unit groups of quotient rings of integers in Some cubic fields. ม.ป.ท.:Chulalongkorn University;Pitchayatak Ponrod และ Ajchara Harnchoowong. Structure of unit groups of quotient rings of integers in Some cubic fields. ม.ป.ท.:Chulalongkorn University, 2016. Print.