HPP testsF. James Rutherford, Gerald James Holton, Fletcher G. Watson, Andrew Ahlgren, Harvard Project Physics · First published 1971Open the Tome
Confidence on achievement tests and the prediction of retentionAndrew Ahlgren · First published 1967Open the Tome
Appropriateness of confidence on achievement testAndrew Ahlgren, Harvard University. Graduate School of Education · First published 1966Open the Tome
