1-Philebus

Plato
Translated by Benjamin Jowett
http://classics.mit.edu/Plato/philebus.html

2-Sophist
 Plato
http://classics.mit.edu/Plato/sophist.html

3-Theaetetus
 Plato
Translated by Benjamin Jowett
http://classics.mit.edu/Plato/theatu.html

4-Crito
 Plato
Translated by Benjamin Jowett
http://classics.mit.edu/Plato/crito.html