1. Still Further Comments on the Scoring of the Continuity Test
2. The Continuity Test in History-Teaching
3. C. W. Odell, Traditional Examinations and New-Type Test, Century Co., New York, 1928, pp. 406–408.
4. M. W. Richardson, J. T. Russell, J. M. Stalnaker, L. L. Thurstone, Manual of Examination Methods. University of Chicago, Chicago, Ill. 1933, p. 104.