Guthrie, W. K. C., & Guthrie, W. K. C. (1979). The later Plato and the academy. Cambridge Univ. Press.

Guthrie, William Keith Chambers, and William Keith Chambers Guthrie. The Later Plato and the Academy. Cambridge [u.a.]: Cambridge Univ. Press, 1979.

Guthrie, William Keith Chambers, and William Keith Chambers Guthrie. The Later Plato and the Academy. Cambridge Univ. Press, 1979.