March 30 (Eastern Orthodox liturgics) (English Wikipedia)

Rev. Sabine Baring-Gould (M.A.). "S. JOHN CLIMACUS, AB. (A.D. 606.)." In: The Lives of the Saints. Volume the Third: March. London: John C. Nimmo, 1897. pp. 506-508.
Rev. Sabine Baring-Gould (M.A.). "S. ZOSIMUS B. OF SYRACUSE. (ABOUT A.D. 660.)." In: The Lives of the Saints. Volume the Third: March. London: John C. Nimmo, 1897. pp. 508-512.
Rev. Sabine Baring-Gould (M.A.). "S. QUIRINUS THE TRIBUNE, M. (A.D. 130.)." In: The Lives of the Saints. Volume the Third: March. London: John C. Nimmo, 1897. p. 504.
Very Rev. John O'Hanlon. "Article V.—St. Regulus, or St. Rule, Patron of St. Andrew's, Scotland. [Said to be of the Fourth Century, but, probably, he lived at a later period]." In: Lives of the Irish Saints: With Special Festivals, and the Commemorations of Holy Persons. VOL. III. Dublin, 1875. pp. 1021-1025.
Rev. Sabine Baring-Gould (M.A.). "S. REGULUS, B. OF ARLES AND SENLIS. (4TH CENT.)." In: The Lives of the Saints. Volume the Third: March. London: John C. Nimmo, 1897. pp. 504-506.
Very Rev. John O'Hanlon. "Article II.—St. Fergus or Fergussius, Bishop of Downpatrick. [Sixth Century]." In: Lives of the Irish Saints: With Special Festivals, and the Commemorations of Holy Persons. VOL. III. Dublin, 1875. pp. 1011-1014.
Very Rev. John O'Hanlon. "ARTICLE I.—ST. TOLA, ABBOT AND BISHOP OF DISERT TOLA. [SEVENTH AND EIGHTH CENTURIES]." In: Lives of the Irish Saints: With Special Festivals, and the Commemorations of Holy Persons. VOL. III. Dublin, 1875. pp. 1008-1011.
Very Rev. John O'Hanlon. "Article III.—St. Patto, Abbot of Amarbaric, and Bishop of Verden, in Saxony. [Eighth and Ninth Centuries]." In: Lives of the Irish Saints: With Special Festivals, and the Commemorations of Holy Persons. VOL. III. Dublin, 1875. pp. 1014-1016.
Rev. Richard Stanton. A Menology of England and Wales, or, Brief Memorials of the Ancient British and English Saints Arranged According to the Calendar, Together with the Martyrs of the 16th and 17th Centuries. London: Burns & Oates, 1892. p. 137.

ecclesia.gr

(in Greek) Συναξαριστής. 30 Μαρτίου. ECCLESIA.GR. (H ΕΚΚΛΗΣΙΑ ΤΗΣ ΕΛΛΑΔΟΣ).

holytrinityorthodox.com

April 12 / March 30. HOLY TRINITY RUSSIAN ORTHODOX CHURCH (A parish of the Patriarchate of Moscow).

mospat.ru

(in Russian) 30 марта (ст.ст.) 12 апреля 2013 (нов. ст.). Русская Православная Церковь Отдел внешних церковных связей. (DECR).

oca.org

Prophet Joad. OCA - Lives of the Saints.
Apostle Sosthenes of the Seventy. OCA - Lives of the Saints.
Apostle Apollos of the Seventy. OCA - Lives of the Saints.
Apostle Cephas of the Seventy. OCA - Lives of the Saints.
Apostle Caesar of the Seventy. OCA - Lives of the Saints.
Apostle Epaphroditus of the Seventy. OCA - Lives of the Saints.
St Euboula the Mother of St Panteleimon. OCA - Lives of the Saints.
Venerable John the Silent of St Sava’s Monastery. OCA - Lives of the Saints.
Venerable John Climacus of Sinai, Author of “the Ladder”. OCA - Lives of the Saints.
St Zosimus the Bishop of Syracuse. OCA - Lives of the Saints.
St Sophronius the Bishop of Irkutsk. OCA - Lives of the Saints.
The Meeting of the Mother of God and Saint Elizabeth. OCA - Feasts and Saints.

orthochristian.com

March 30/April 12. Orthodox Calendar (PRAVOSLAVIE.RU).

orthodoxengland.org.uk

March 30. Latin Saints of the Orthodox Patriarchate of Rome.

synaxarion.gr

Great Synaxaristes: (in Greek) Ὁ Ὅσιος Ἰωάννης ὁ Ἀσκητὴς. 30 ΜΑΡΤΙΟΥ. ΜΕΓΑΣ ΣΥΝΑΞΑΡΙΣΤΗΣ.
Great Synaxaristes: (in Greek) Ὁ Ἅγιος Ἰωάννης Πατριάρχης Ἱεροσολύμων. 30 ΜΑΡΤΙΟΥ. ΜΕΓΑΣ ΣΥΝΑΞΑΡΙΣΤΗΣ.
Great Synaxaristes: (in Greek) Ὁ Ὅσιος Ἰωάννης τῆς Κλίμακος. 30 ΜΑΡΤΙΟΥ. ΜΕΓΑΣ ΣΥΝΑΞΑΡΙΣΤΗΣ.
Great Synaxaristes: (in Greek) Ὁ Ἅγιος Ζαχαρίας ὁ Ἱερομάρτυρας Ἐπίσκοπος Κορίνθου. 30 ΜΑΡΤΙΟΥ. ΜΕΓΑΣ ΣΥΝΑΞΑΡΙΣΤΗΣ.
Great Synaxaristes: (in Greek) Ὁ Ἅγιος Σωφρόνιος Ἐπίσκοπος Ἰρκούτσκ καὶ πάσης Σιβηρίας. 30 ΜΑΡΤΙΟΥ. ΜΕΓΑΣ ΣΥΝΑΞΑΡΙΣΤΗΣ.

wikipedia.org

ru.wikipedia.org

See also: (in Russian) Софроний (Кристалевский). Википедии. (Russian Wikipedia).