1. Grand unified theories and proton decay
2. A number of original articles are reprinted in (i) Gauge Theory of Weak and Electromagnetic Interactions, Edited by (World Scientific, Singapore, 1980).
3. (ii) Gauge Theories of Fundamental Interactions, Edited by and (World Scientific, Singapore, 1981).
4. For cosmology, Gravitation and Cosmology, John Wiley, 1972.
5. Physical Cosmology, Princeton Univ., 1971.