A B C Cumont, Franz, The Mysteries of Mithra, Chicago, London, 1903Cumont, Franz, The Mysteries of Mithra, Second Edition, Chicago, London, 1910 D E F G H I J K L M N O P Porphyry, On the Cave of the Nymphs, London, 1823 (Philaletheans online edition 2018) Porphyry, On the Cave of the Nymphs, London, 1917Porphyry, Select Works, London, 1823 Q R S T U V W X Y Z