Naradol Thaisuchart และ Nipapun Kungskulniti. (2010) Utilization of Bituminous fly ash for hollow concrete block production. Mahidol University:ม.ป.ท.Naradol Thaisuchart และ Nipapun Kungskulniti. 2010. Utilization of Bituminous fly ash for hollow concrete block production. ม.ป.ท.:Mahidol University;Naradol Thaisuchart และ Nipapun Kungskulniti. Utilization of Bituminous fly ash for hollow concrete block production. ม.ป.ท.:Mahidol University, 2010. Print.