1. Boss, B. 1937. General Catalogue of 33,342 Stars. Washington: Carnegie Institution.
2. Chapman, A. 1983. “The Accuracy of Angular Measuring Instruments Used in Astronomy between 1500 and 1850.” Journal for the History of Astronomy, 14, 133–137.
3. Chapman, A. 1990. Dividing the Circle: The Development of Critical Angular Measurement in Astronomy, 1500–1850. New York: Harwood.
4. Dahn, C.C., D.G. Monet, et al. 1990. “Results from the First List of USNO CCD Parallaxes.” Bulletin of the American Astronomical Society 22: 820.
5. International Astronomical Union Symposium 133,1988