RT Book T1 A study of self-structure and level of aspiration in delinquent and non-delinquent boys A1 Selden, Edward H. LA English PP Ann Arbor, Mich. PB Univ. Microfilms YR 1975 UL https://krimdok.uni-tuebingen.de/Record/1094438723 K1 Hochschulschrift