References
- Covey , S. 1996 . First things first , New York : Fireside Books .
- Oldenburg , D. 1988 . Fast forward: Living in artificial time . Health , 20 : 80 – 81 . 52-56
- Simon , S. , Howe , L. and Kirschenbaum , H. 1978 . Values clarification: A handbook of practical strategies for students and teachers , Sunderland , MA : Values Press .