1. P. Langacker, Phys. Rep. 72 185 (1981).
2. J. Ellis, 1981 Les Houches Lectures, CERN TH 3174 (1981).
3. Pedagogical introductions to the SU(2)xU(l) model of Glashow, Weinberg, Salam and Ward may be found in
4. H. Fritzsch and P. Minkowski, Phys. Rep. 73: 67 (1981).
5. I.J.R. Aitchison and A.J.G. Hey, “Gauge Theories in Particle Physics” Adam Hilger, Bristol (1982).