On the Eve of Poltava the Letters of Ivan Mazepa to Adam Sieniawski 1704-1708 (англ.)

On the Eve of Poltava: The Letters of Ivan Mazepa
to Adam Sieniawski 1704–1708 / Ed. O. Subtelny. Preface by O. Ohloblyn. New York: The Ukrainian Academy of Arts and Sciences in the U.S., 1975. — 159 p.