RT Article T1 Beyond black and white: the present and future of multiracial friendship segregation JF American sociological review VO 68 IS 4 SP 540 OP 566 A1 Quillian, Lincoln A1 Campbell, Mary E. LA English YR 2003 UL https://krimdok.uni-tuebingen.de/Record/1639842446 K1 Freundschaftsbeziehungen K1 Rassenzugehörigkeit K1 Assimilation K1 USA K1 Immigration