March 29 (Eastern Orthodox liturgics) (English Wikipedia)

Rev. Sabine Baring-Gould (M.A.). "SS. JONAS AND BARACHISIUS, MM. (A.D. 327.)." In: The Lives of the Saints. Volume the Third: March. London: John C. Nimmo, 1897. p. 491.
The Roman Martyrology. Transl. by the Archbishop of Baltimore. Last Edition, According to the Copy Printed at Rome in 1914. Revised Edition, with the Imprimatur of His Eminence Cardinal Gibbons. Baltimore: John Murphy Company, 1916. p. 90.
Rev. Sabine Baring-Gould (M.A.). "SS. MARK, B. C, AND CYRIL, D. M. (A.D. 362.)." In: The Lives of the Saints. Volume the Third: March. London: John C. Nimmo, 1897. pp. 492-495.
Rev. Sabine Baring-Gould (M.A.). "SS. ARMOGASTES AND COMPANIONS, MM. (ABOUT A.D. 463.)." In: The Lives of the Saints. Volume the Third: March. London: John C. Nimmo, 1897. pp. 496-498.
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. pp. 136-137.
Very Rev. John O'Hanlon. "Article IV.—St. Lasar, Lassar, or Lassera, Virgin. [Sixth Century]." In: Lives of the Irish Saints: With Special Festivals, and the Commemorations of Holy Persons. VOL. III. Dublin, 1875. pp. 996-998.
Very Rev. John O'Hanlon. "Article V.—St. Eustace, or Eustasius, Abbot of Luxeu, France. [Sixth and Seventh Centuries]." In: Lives of the Irish Saints: With Special Festivals, and the Commemorations of Holy Persons. VOL. III. Dublin, 1875. pp. 998-1006.
Rev. Sabine Baring-Gould (M.A.). "S. EUSTACE, AB. OF LUXEUIL. (A.D. 625.)." In: The Lives of the Saints. Volume the Third: March. London: John C. Nimmo, 1897. pp. 498-501.

ecclesia.gr

(in Greek) Συναξαριστής. 29 Μαρτίου. ECCLESIA.GR. (H ΕΚΚΛΗΣΙΑ ΤΗΣ ΕΛΛΑΔΟΣ).

holytrinityorthodox.com

April 11 / March 29. HOLY TRINITY RUSSIAN ORTHODOX CHURCH (A parish of the Patriarchate of Moscow).

mospat.ru

(in Russian) 29 марта (ст.ст.) 11 апреля 2013 (нов. ст.). Русская Православная Церковь Отдел внешних церковных связей. (DECR).

oca.org

Hieromartyr Mark the Bishop of Arethusa, who suffered under Julian the Apostate. OCA - Lives of the Saints.
Martyr Cyril the Deacon of Heliopolis, who suffered under Julian the Apostate. OCA - Lives of the Saints.
Venerable John the Anchorite of Egypt. OCA - Lives of the Saints.
St Eustathius (Eustace) the Confessor, Bishop of Bithynia. OCA - Lives of the Saints.
Venerable Jonah (John) of the Pskov Caves. OCA - Lives of the Saints.
Venerable Mark of the Pskov Caves. OCA - Lives of the Saints.

orthochristian.com

March 29/April 11. Orthodox Calendar (PRAVOSLAVIE.RU).

orthodoxengland.org.uk

March 29. Latin Saints of the Orthodox Patriarchate of Rome.

synaxarion.gr

Great Synaxaristes: (in Greek) Οἱ Ἅγιοι Ἰωνᾶς, Βαραχήσιος, Ἄβιβος, Ζανιθᾶς, Ἠλίας, Λάζαρος, Μάρης, Μαρουθᾶς, Ναρσῆς, Σάββας καὶ Σιμιάθος οἱ Μάρτυρες. 29 ΜΑΡΤΙΟΥ. ΜΕΓΑΣ ΣΥΝΑΞΑΡΙΣΤΗΣ.
Great Synaxaristes: (in Greek) Ὁ Ἅγιος Μάρκος Ἐπίσκοπος Ἀρεθουσίων. 29 ΜΑΡΤΙΟΥ. ΜΕΓΑΣ ΣΥΝΑΞΑΡΙΣΤΗΣ.
Great Synaxaristes: (in Greek) Ὁ Ἅγιος Κύριλλος ὁ Ἱερομάρτυρας καὶ οἱ σὺν αὐτῷ ἄνδρες καὶ γυναῖκες Μάρτυρες ἐν Ἀσκαλώνι καὶ Γάζῃ. 29 ΜΑΡΤΙΟΥ. ΜΕΓΑΣ ΣΥΝΑΞΑΡΙΣΤΗΣ.
Great Synaxaristes: (in Greek) Ὁ Ἅγιος Διάδοχος Ἐπίσκοπος Φωτικῆς τῆς Παλαιᾶς Ἠπείρου. 29 ΜΑΡΤΙΟΥ. ΜΕΓΑΣ ΣΥΝΑΞΑΡΙΣΤΗΣ.
Great Synaxaristes: (in Greek) Ὁ Ὅσιος Ἠσύχιος ὁ Σιναΐτης. 29 ΜΑΡΤΙΟΥ. ΜΕΓΑΣ ΣΥΝΑΞΑΡΙΣΤΗΣ.
Great Synaxaristes: (in Greek) Ὁ Ἅγιος Εὐστάθιος ὁ Ὁμολογητής Ἐπίσκοπος Κίου Βιθυνίας. 29 ΜΑΡΤΙΟΥ. ΜΕΓΑΣ ΣΥΝΑΞΑΡΙΣΤΗΣ.
Great Synaxaristes: (in Greek) Οἱ Ὅσιοι Μάρκος, Ἰωνᾶς καὶ Βάσσος. 29 ΜΑΡΤΙΟΥ. ΜΕΓΑΣ ΣΥΝΑΞΑΡΙΣΤΗΣ.

ukrainian-orthodoxy.org

Dr. Alexander Roman. March. Calendar of Ukrainian Orthodox Saints (Ukrainian Orthodoxy - Українське Православ'я).