Gutierrez และผู้แต่งคนอื่นๆ. (2009) Determinants of physician services utilization among public insured elderly in Chile. Chulalongkorn University:ม.ป.ท.Gutierrez และผู้แต่งคนอื่นๆ. 2009. Determinants of physician services utilization among public insured elderly in Chile. ม.ป.ท.:Chulalongkorn University;Gutierrez และผู้แต่งคนอื่นๆ. Determinants of physician services utilization among public insured elderly in Chile. ม.ป.ท.:Chulalongkorn University, 2009. Print.