A set of thirty-six prose passages calibrated for complexity

[1]  William Anderson McCall,et al.  Standard Test Lessons in Reaping , 1925, Teachers College Record: The Voice of Scholarship in Education.

[2]  Bernice E. Leary,et al.  What makes a book readable , 1935 .

[3]  R. Flesch.  Marks of readable style , 1943 .

[4]  Claude E. Shannon,et al.  Prediction and Entropy of Printed English , 1951 .

[5]  E. B. Newman,et al.  A new method for analyzing printed English. , 1952, Journal of experimental psychology.

[6]  E C Carterette,et al.  Redundancy in Children's Texts , 1963, Science.