1. Aslib-Cranfield Research Project: Report on the First Stage of an Investigation into the Comparative Efficiency of Indexing Systems (Cranfield, College of Aeronautics, September 1960);
2. Interim Report on the Test Program of an Investigation into the Comparative Efficiency of Indexing Systems (Cranfield, November 1960);
3. Report on the Testing and Analysis of an Investigation into the Efficiency of Indexing Systems (Cranfield, October 1962).
4. The TESTING OF INDEX LANGUAGE DEVICES