Gibbons, G. W., Shellard, E., & Rankin, S. (2009). Future of theoretical physics and cosmology: Celebrating Stephen Hawking's contributions to physics. Cambridge university press.

Gibbons, G. W., E.P.S Shellard, and S.J Rankin. Future of Theoretical Physics and Cosmology: Celebrating Stephen Hawking's Contributions to Physics. Cambridge: Cambridge university press, 2009.

Gibbons, G. W., et al. Future of Theoretical Physics and Cosmology: Celebrating Stephen Hawking's Contributions to Physics. Cambridge university press, 2009.