Plato & Xenophon 
The Real Socrates 
The Dialogues Written in Defense of Socrates by the Founders of Western Philosophy: Memorabilia, Apology, Crito, Phaedo

Socrates was an enigmatic figure; he made no writings, and is known chiefly through the accounts of his students Plato and Xenophon. After Socrates was accused of impiety against the pantheon of Athens and corruption of the youth and sentenced to death, his students stood up in his defense. In the unique form of Socratic dialogue both, Plato and Xenophon, defended the character and teachings of their teacher.
The Life of Socrates
Defenses of Socrates
Defense by Plato
Apology
Crito
Phaedo
Defense by Xenophon
Memorabilia
Apology