Thinking : The Second International Conference Perkins, D. N. Lochhead, J. Bishop, J. C. 9780898598056 Innbundet 01.08.1987 Engelsk I salg
The Teaching of Thinking Perkins, D. N. Nickerson, R. S. Smith, E. E. 9780898595390 Innbundet 01.11.1985 Engelsk I salg
