The origin of Rus'
Pritsak, Omeljan.
The origin of Rus': an inaugural lecture, October 24, 1975 /
Omeljan Pritsak, Mykhailo S. Hrushevs'kyi
. - Cambridge : Harvard Ukrainian Research Institute, 1976
. - 28 p. 25 cm.
- Occasional papers / Harvard Ukrainian Research Institute .