Bonnor, W. B., & MacCallum, M. A. H. (1985). Galaxies, axisymmetric systems and relativity: Essays presented to W.B. Bonnor on his 65th birthday. Cambridge University Press.

Bonnor, William B., and M. A. H. MacCallum. Galaxies, Axisymmetric Systems and Relativity: Essays Presented to W.B. Bonnor on His 65th Birthday. Cambridge [Cambridgeshire] ; New York: Cambridge University Press, 1985.

Bonnor, William B., and M. A. H. MacCallum. Galaxies, Axisymmetric Systems and Relativity: Essays Presented to W.B. Bonnor on His 65th Birthday. Cambridge University Press, 1985.