Further reading about Christian Orthodoxy :

The Orthodox Church, by Right Reverend Bishop Kallistos (Ware) of Diokleia (2nd ed., Pelican, 1993 ISBN 0140146563)

The Orthodox Way, by  by Right Reverend Bishop Kallistos (Ware) of Diokleia (St Vladimir's Seminary Press, 1995, ISBN 0913836583)

On Ascetical Life, By St Isaac of Nineveh, ISBN 0-88141-077-2

"Dancing Alone: The Quest for Orthodox Faith in the Age of False Religion" by Frank Schaeffer, MA Holy Cross, 1994.
 

More orthodox books are available online at :

www.orthodoxbooks.co.uk

www.orthodoxmarketplace.com