The Gospel of Philip is the third tractate in Nag Hammadi Codex II (hereafter, NHC II), and the Gospel of Mary is the first tractate in the closely related Berlin Gnostic Codex (BG). See James M. Robinson and Richard Smith, eds., The Nag Hammadi Library in English, 3rd rev. ed. (Leiden: E.J. Brill; New York: Harper & Row, 1988), pp. 139–160 and 523–527 respectively. The translations given here are from that volume. The translations given in Dan Brown’s novel are rather free.