The Athenian Agora; Volume 20; The Church of the Holy Apostles; Introduction K.S. Pittakys, L' ancienne Athènes, 1835, pp. 43, 46, 48 Lenoir, L' architecture monastique, I, 1852, p. 252 A. Mommsen, Athenae christianae, 1868, pp. 24-25, 91-92 A.Choisy, L' art de bâtir chez les byzantins, 1883, pp. 132-133 A. Choisy, Histoire de l'architecture, II, 1889, pp. 34-35 G. Lambakis, Στοά, 12 August 1884, p. 3 G. Lambakis, Εβδομάς, 1884, p. 189, note 1β G. Lambakis, Mémoire sur les antiquités chrétiennes de la Grèce, 1902, p. 12 Neroutsos, ΔΙΕΕ, ΙΙΙ, 1889, p. 74 Kambouroglou, Ὶστορία, II, 1889, p. 293 Kambouroglou, Παλαιά Ἀθῆναι, 1922, p. 160 O. Wulff, Die Baukunst, II, 1903, pp. 395, 481 A. Struck, Athen und Attika, 1911, p. 141 Th. Philadelpheus, Ὶστορία τῶν Ἀθηνῶν ἐπί Τουρκοκρατίας, 1902, I, p. 276 J. Strzygowski, Die Baukunst der Armenier, 1918, II, p. 798 G.T. Rivoira, Lombardic Architecture: Its Origin, Development and Derivatives (tr. G.McN. Rushforth), 1910, I, p. 187 A. Xyngopoulos, ΕΜΜΕ, I, pp. 77-79 Megaw, Chronology, passim Ebersolt, Chap. X Orlandos, ΑΒΜΕ, VII, 1951, and XI, 1969, pp. 65-66, 81-82 A. Frantz, Byzantion, XXIV, 1954, pp. 513-520 A. Frantz, The Middle Ages in the Athenian Agora, Picture Book No. 7, 1961, figs. 46-59 J. Travlos, Πολεοδομική, 1960, pp. 151, 155 J. Travlos, Χριστιανικαί Ἀθῆναι, in Θρησκευτική Ἠθική Ἐγκυκλοπαδεία, 1962, p. 738 Krautheimer, 1965, pp. 275-277 Propyläen Kunstgeschichte, III, Byzanz (Chatzidakis), 1968, p. 225 and fig. 148 Stikas, H.L., 1970, pp. 193 Kedrenos, II, 475 (Bonn) Glykas, IV, 578-579 (Bonn) Zonaras, XVII, 9