Salam, A., Dirac, P. A. M. 1., Evans, J., Watts, G., Dirac, P. A. M. 1., Evans, J. M., & Dirac, P. A. M. (1990). Unification of fundamental forces: The first of the 1988 Dirac memorial lectures. Cambridge [England] ; New York: Cambridge University Press.

Salam, Abdus, P. A. M. 1902- Dirac, Jonathan Evans, Gerard Watts, P. A. M. 1902-1984 Dirac, Jonathan M. Evans, and P. A. M. Dirac. Unification of Fundamental Forces: The First of the 1988 Dirac Memorial Lectures. Cambridge [England] ; New York: Cambridge University Press, 1990.

Salam, Abdus, et al. Unification of Fundamental Forces: The First of the 1988 Dirac Memorial Lectures. Cambridge [England] ; New York: Cambridge University Press, 1990.