1. A new gravity map, a new marine geoid around Japan and the detection of the Kuroshio current
2. Barbaste, J., 1987. Towards the Universal Transverse Mercator. Final year student report, University of the West Indies, St. Augustine, Trinidad.
3. Charles, Festus, 1971. A study of coordinate transformations for Trinidad. M.Sc. thesis, Department of Geodetic Science, The Ohio State University, Columbus, Ohio.
4. Charles, Festus, 1985. Personal communications. Port of Spain, Trinidad.