Other Greek Historians

Amazon. Portable Greek Historians : The Essence of Herodotus, Thucydides, Xenophon, Polybius by Moses I. Finley (Editor)

Thucydides

EText of John Finley's Three Essays on Thucydides (1966).

Etext of Francis M. Cornford, Thucydides Mythistoricus (1907). Seminal.

Amazon. The Landmark Thucydides "A Comprehensive Guide to the Peloponnesian War." Translation by Richard Crawley, edited by Robert B. Strassler, with contributions by others. Strassler has added maps, running commentary and a large number of short background essays.

Unfortunately, there aren't any reviews of this work online.

Harvard Business School, Strassler's alma mater, on his writing efforts. See also Harvard Magazine.

Selections from Thucydides, The Peloponnesian War. Translated by Lewis Stiles, University of Saskatchewan. Also here.