Olga of Kiev (English Wikipedia)

Repin, Taras. "Что на самом деле означали знаки Рюриковичей" [What did the Rurikids' symbols really mean?]. cyrillitsa.ru (in Russian). Retrieved 24 May 2020. Князья до Владимира (Игорь, Святослав, Ярополк), как утверждает археолог Сергей Белецкий, пользовались двузубцами

diasporiana.org.ua

Omeljan Pritsak, "When and Where Was Ol'ga Baptized?" Harvard Ukrainian Studies 9, no. 1/2 (June 1985): 5–24.

"Olga (c. 890–969)". Women in World History: A Biographical Encyclopedia. 2002.

Sheldon, Natasha (February 11, 2018). "Saint Olga of Kiev is the Best Warrior Princess You Never Knew". History Collection. Retrieved February 22, 2022.

"История храма" [Cathedral History]. hram-olgi.ru (in Russian). 7 December 2015. Retrieved 8 June 2020. 20 September 2014

"От Ольги до Ольги" [From Olga to Olga] (in Russian). Kommersant. 24 July 2003. Retrieved 8 June 2020.

Cross & Sherbowitz-Wetzor 1953, p. 82. Cross, Samuel Hazzard; Sherbowitz-Wetzor, Olgerd P. (1953) [1930]. The Russian Primary Chronicle, Laurentian Text. Translated and edited by Samuel Hazzard Cross and Olgerd P. Sherbowitz-Wetzor (PDF). Cambridge, Massachusetts: The Mediaeval Academy of America. p. 325. (The first 50 pages are a scholarly introduction).
Cross & Sherbowitz-Wetzor 1953, pp. 79–80. Cross, Samuel Hazzard; Sherbowitz-Wetzor, Olgerd P. (1953) [1930]. The Russian Primary Chronicle, Laurentian Text. Translated and edited by Samuel Hazzard Cross and Olgerd P. Sherbowitz-Wetzor (PDF). Cambridge, Massachusetts: The Mediaeval Academy of America. p. 325. (The first 50 pages are a scholarly introduction).
Cross & Sherbowitz-Wetzor 1953, pp. 80–81. Cross, Samuel Hazzard; Sherbowitz-Wetzor, Olgerd P. (1953) [1930]. The Russian Primary Chronicle, Laurentian Text. Translated and edited by Samuel Hazzard Cross and Olgerd P. Sherbowitz-Wetzor (PDF). Cambridge, Massachusetts: The Mediaeval Academy of America. p. 325. (The first 50 pages are a scholarly introduction).
Cross & Sherbowitz-Wetzor 1953, p. 86. Cross, Samuel Hazzard; Sherbowitz-Wetzor, Olgerd P. (1953) [1930]. The Russian Primary Chronicle, Laurentian Text. Translated and edited by Samuel Hazzard Cross and Olgerd P. Sherbowitz-Wetzor (PDF). Cambridge, Massachusetts: The Mediaeval Academy of America. p. 325. (The first 50 pages are a scholarly introduction).

"История" [History]. hram-olgi.moseparh.ru (in Russian). Retrieved 8 June 2020.

Obolensky, Dimitri (1984). "The baptism of Princess Olga of Kiev". Philadelphie et autres études. §19. ISBN 978-2-85944-079-4.

"The monument to Saint Olga Equal-to-apostles". pskovgorod.ru. Gorod Pskov. Retrieved 2 August 2020.

"Notable Lutheran Saints". Resurrectionpeople.org. Archived from the original on 2019-05-16. Retrieved 2019-07-16.

"Princess Olga. Spiritual Mother of All Rus'". Russia Forever. August 1, 2013. Retrieved 23 October 2020.

"Римско-католический приход святой Ольги" [St. Olga Roman Catholic Parish]. Retrieved September 15, 2019. founded in 1991

"Испытание верой: мифы о крещении Руси" [Test by faith: myths about the baptism of Rus] (in Russian). TASS. 26 July 2019. Retrieved 8 June 2020.

Gasparov & Raevsky-Hughes 1993, pp. 257–258. Gasparov, Boris; Raevsky-Hughes, Olga (1993). California Slavic Studies. Vol. XVI: Slavic Culture in the Middle Ages. University of California Press. p. 81. ISBN 978-0-520-07945-8.

"Notable Lutheran Saints". Resurrectionpeople.org. Archived from the original on 2019-05-16. Retrieved 2019-07-16.