Reference
- Dale , E. and Chall , J.S. 1948 . A formula for predicting readability . Educational Research Bulletin , 27 January : 11 – 20 . 28
- Dale , E. and Chall , J.S. 1948 . A formula for predicting readability: Instructions . Educational Research Bulletin , 27 February : 37 – 54 .
- Flesch , R.F. 1948 . A new readability yardstick . Journal of Applied Psychology , 32 June : 221 – 233 .
- Fry , E. 1977 . Fry's readability graph: Clarification, validity, and extension to level 17 . Journal of Reading , 21 December : 242 – 252 .
- Lorge , I. 1944 . Predicting readability . Teachers College Record , 45 March : 404 – 410 .