Kovalev 2012, p. 506. Kovalev, Roman K. (2012). "Grand Princess Olga of Rus' Shows the Bird: Her 'Christian Falcon' Emblem". Russian History. 39 (4): 460–517. doi:10.1163/48763316-03904002.
Kovalev 2012, p. 503f. Kovalev, Roman K. (2012). "Grand Princess Olga of Rus' Shows the Bird: Her 'Christian Falcon' Emblem". Russian History. 39 (4): 460–517. doi:10.1163/48763316-03904002.
Kovalev 2012, p. 504f. Kovalev, Roman K. (2012). "Grand Princess Olga of Rus' Shows the Bird: Her 'Christian Falcon' Emblem". Russian History. 39 (4): 460–517. doi:10.1163/48763316-03904002.
Kovalev 2012, p. 508f. Kovalev, Roman K. (2012). "Grand Princess Olga of Rus' Shows the Bird: Her 'Christian Falcon' Emblem". Russian History. 39 (4): 460–517. doi:10.1163/48763316-03904002.
Kovalev 2012, p. 510f. Kovalev, Roman K. (2012). "Grand Princess Olga of Rus' Shows the Bird: Her 'Christian Falcon' Emblem". Russian History. 39 (4): 460–517. doi:10.1163/48763316-03904002.
Kovalev 2012, p. 510f, 513. Kovalev, Roman K. (2012). "Grand Princess Olga of Rus' Shows the Bird: Her 'Christian Falcon' Emblem". Russian History. 39 (4): 460–517. doi:10.1163/48763316-03904002.
Kovalev 2012, p. 461f. Kovalev, Roman K. (2012). "Grand Princess Olga of Rus' Shows the Bird: Her 'Christian Falcon' Emblem". Russian History. 39 (4): 460–517. doi:10.1163/48763316-03904002.
Kovalev 2012, p. 478ff. Kovalev, Roman K. (2012). "Grand Princess Olga of Rus' Shows the Bird: Her 'Christian Falcon' Emblem". Russian History. 39 (4): 460–517. doi:10.1163/48763316-03904002.
Kovalev 2012, p. 483. Kovalev, Roman K. (2012). "Grand Princess Olga of Rus' Shows the Bird: Her 'Christian Falcon' Emblem". Russian History. 39 (4): 460–517. doi:10.1163/48763316-03904002.
Kovalev 2012, p. 489–491ff. Kovalev, Roman K. (2012). "Grand Princess Olga of Rus' Shows the Bird: Her 'Christian Falcon' Emblem". Russian History. 39 (4): 460–517. doi:10.1163/48763316-03904002.
Kovalev 2012, p. 467. Kovalev, Roman K. (2012). "Grand Princess Olga of Rus' Shows the Bird: Her 'Christian Falcon' Emblem". Russian History. 39 (4): 460–517. doi:10.1163/48763316-03904002.
Kovalev 2012, p. 469. Kovalev, Roman K. (2012). "Grand Princess Olga of Rus' Shows the Bird: Her 'Christian Falcon' Emblem". Russian History. 39 (4): 460–517. doi:10.1163/48763316-03904002.