J. McKim Malville

, 2008a, Astronomy of Nabta playa, in J. C. Holbrook, J. Urama & R. Thebe Medupe (eds.), African cultural astronomy, Dordrecht, Springer, pp. 131-143.

, 2008b, The astronomical gnomon, in J. C. Holbrook, J. Urama & R. Thebe Medupe (eds.), African cultural astronomy, Dordrecht, Springer, pp. 39-51.