STRUK, DANYLO HUSAR, editor. “O.” Encyclopedia Ukraine: Volume III: L-Pf, University of Toronto Press, Toronto; Buffalo; London, 1993, pp. 643–745, www.jstor.org/stable/10.3138/j.ctt15jjf6b.6. Accessed 20 Sept. 2020.
O. (1993). In STRUK D. (Ed.), Encyclopedia Ukraine: Volume III: L-Pf (pp. 643-745). Toronto; Buffalo; London: University of Toronto Press. Retrieved September 20, 2020, from http://www.jstor.org/stable/10.3138/j.ctt15jjf6b.6
"O." In Encyclopedia Ukraine: Volume III: L-Pf, edited by STRUK DANYLO HUSAR, 643-745. Toronto; Buffalo; London: University of Toronto Press, 1993. Accessed September 20, 2020. http://www.jstor.org/stable/10.3138/j.ctt15jjf6b.6.
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