ISBN 0-8020-3105-6 Simovyc, V., and J. B. Rudnyckyj, "The history of Ukrainian orthography", in Ukraine: a concise encyclopædia, volume 1 (op cit).
ISBN 0-8020-3105-6 Simovyc, V., and J. B. Rudnyckyj, «The history of Ukrainian orthography», in Ukraine: a concise encyclopædia, volume 1 (op cit).