John Chrysostom's homily on Matthew 1:25 - https://www.newadvent.org/fathers/200105.htmEnglish translation of the "Protoevangelion of James" - https://www.earlychristianwritings.com/text/infancyjames-hock.html"Belief in the perpetual virginity of Mary in the first four centuries and its implications for Orthodox-Protestant dialogue" by Радостин Марчев (for historical notes only) - https://www.academia.edu/45019387/Belief_in_the_perpetual_virginity_of_Mary_in_the_first_four_centuries_and_its_implications_for_Orthodox_Protestant_dialogue