1. L-Matrix Theory or the Grammar of Dirac Matrices (Tata-McGraw Hill, New Delhi, India, 1972), (This contains the list of papers published in the Journal of Mathematical Analysis and Applications, 1967–72.)
2. Tories in Numerical Analysis, Ed. J.H. Miller, Academic Press, 132 (1976). (Proceedings of the conference on numerical analysis held in Dublin, Ireland, 1974.)
3. Symmetries in Science, Ed. Bruno Gruber and R.S. Millman, Plenum Press, New York and London, 323 (1979). (Proceedings of the Einstein Centennial Celebration Science Symposium at Southern Illinois University, Carbondale, Illinois, U.S.A., 1979.)
4. A. Ramakrishnan, ‘The Dirac Hamiltonian as a member of a hierarchy of matrices’, J. Math. Anal. and Applications, 20, 9–l6, 1967.