RT Article T1 Variation in how frequently adolescents think about the past, the present, and the future in relation to academic achievement JF Diskurs Kindheits- und Jugendforschung VO 4 IS 2 SP 173 OP 183 A2 Mello, Zena R. LA English YR 2009 UL https://krimdok.uni-tuebingen.de/Record/1625591306 K1 Zeiterleben K1 Schulleistung K1 Jugendliche