Sankara's Vivekachudamani is a popular Advaita Vedanta text which gives its basic principles. Text comes with Sanskrit and English translation. A verse index in Sanskrit is included. See also Shankara's Crest Jewel of Discrimination for a more western translation of this important scripture of Shankara.
About the Author:
Sankara (also spelled Shankara) is an ancient yogi and one of the most revered commentators of India's scriptures. For many, he is the ultimate authority of a scripture's meaning.