1. The Visual Fields: A Textbook and Atlas of Clinical Perimetry;Harrington,1956
2. Quantitative and qualitative perimetric studies with monochromatic and white targets;Matteucci;Rass. ital. ottal.,1946
3. Clinical Perimetry;Traquair,1957
4. Walsh, F. B.: Personal observation.
5. Lueck, I. B.: Personal communication.