@article{Campbell, author = {Campbell, A. C.}, title = {On the Solving jof Code Items Demanding the Use of Indirect Procedures}, series = {Warson, P. C., Johnson-Laird, P. N. (Eds.): Thinking and Reasoning, Harmondsworth (Penguin Books) 1968, pp. 225-233.}, journal = {Warson, P. C., Johnson-Laird, P. N. (Eds.): Thinking and Reasoning, Harmondsworth (Penguin Books) 1968, pp. 225-233.}, language = {en} }