RT Article T1 Assessing direct and indirect effects in multilevel designs with latent variables JF Sociological methods and research VO 28 IS 2 SP 123 OP 153 A1 Raudenbush, Stephen 1946- A2 Sampson, Robert LA English YR 1999 UL https://krimdok.uni-tuebingen.de/Record/1912461544 DO 10.1177/0049124199028002001