1. A study of the statistics of letters in English words;Bourne;Info. Control,1961
2. Cognitive aspects of information processing;Fitts;J. exp. Psychol.,1962
3. Letter preferences;Horton;J. appl. Psychol.,1960
4. An analysis of meaning;Noble;Psychol. Rev.,1952
5. The teacher's word book of 30,000 words;Thorndike,1944