April 28 (Eastern Orthodox liturgics) (English Wikipedia)

Rev. Sabine Baring-Gould (M.A.). "SS. Aphrodisius and Companions, MM. (Date Uncertain.)" In: The Lives of the Saints. Volume the Fourth: April. London: John C. Nimmo, 1897. p. 358-359.
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. pp. 119-120.
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. 184-185.
Very Rev. John O'Hanlon. "Article I.—St. Cronan, Abbot and Patron of Roscrea, County of Tipperary. [Sixth and Seventh Centuries.]." In: Lives of the Irish Saints: With Special Festivals, and the Commemorations of Holy Persons. VOL. IV. Dublin, 1875. pp. 516-530.
Rev. Sabine Baring-Gould (M.A.). "S. Cronan of Roscrea, AB. (About A.D. 615.)" In: The Lives of the Saints. Volume the Fourth: April. London: John C. Nimmo, 1897. p. 361-362.
Rev. Sabine Baring-Gould (M.A.). "S. Prudentius. B. of Tarazona. (Date Uncertain.)" In: The Lives of the Saints. Volume the Fourth: April. London: John C. Nimmo, 1897. p. 362-363.

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The Miracle at Carthage. Full of Grace and Truth (blog). Wednesday, April 28, 2010.

May 11 / April 28. Holy Trinity Russian Orthodox Church (A parish of the Patriarchate of Moscow).