Felmy, Sabine (1996) The Voice of the Nightingale: A Personal Account of the Wakhi Culture in Hunza Oxford University Press, New York, ISBN 0-19-577599-6. Shahrani, M. Nazif. (1979) The Kirghiz and Wakhi of Afghanistan: Adaptation to Closed Frontiers and War University of Washington Press, Seattle, ISBN 0-295-95669-0; 1st paperback edition with new preface and epilogue (2002), ISBN 0-295-98262-4.