title: Theory and methods in migration and ethnic research.
authors.forename: A
authors.initials: A
authors.lastname: Portes
authors.forename: C
authors.initials: C
authors.lastname: Hirschman
mesh_terms: D003625:Data Collection; D003710:Demography; D004641:Emigration and Immigration; D005191:Family Characteristics; D011153:Population; D011157:Population Dynamics; D012106:Research; D012923:Social Class; D014171:Transients and Migrants
keywords: Data Collection; Demographic Factors; Households; Illegal Migrants; International Migration; Migration--history; Population; Population Dynamics; Research Methodology; Socioeconomic Status; Temporary Migration