Ledyard, John 1751-1789.
John Ledyard's journey through Russia and Siberia, 1787-1788: the journal and selected letters /
edited with an introduction by Stephen D. Watrous 
. - Madison : Milwaukee : London : University of Wisconsin Press,  1966 
. - xiv, 293 p.  22 cm. 
<br/>К.: Бібліогр. : c. 265-279, Index