Recommended translation: "Crito" in Four Texts on Socrates,  trans. Thomas G. West and Grace Starry West (Cornell University Press: 1984, rev. 1998).  

About the dialogue:

In the Crito, Socrates discusses with Crito the meaning of justice and injustice—and what a proper response to injustice is.

Online:
Amazon (Recommended Translation)
Project Perseus (English, Free Access)
Project Perseus (Greek, Free Access)
Project Gutenberg (English, Free Access)