1. George Chrystal, Algebra, Part I, 1st ed., Black, 1886; 2nd ed., 1889.
2. H. S. M. Coxeter, Introduction to Geometry, Wiley, 1961.
3. Euclid, Elements (translated with introduction and commentary by Sir T. L. Heath), 2nd ed., Dover, 1956.
4. Fields generated by linear combinations of roots of unity, II.