Burkert, Walter (1985): . Deane, John Bathurst (1833): , kapittel V, s. 329. Farnell, Lewis Richard (1896): . Fontenrose, Joseph Eddy (1959): . Goodrich, Norma Lorre (1990): . Guthrie, William Keith Chambers (1955): . Hall, Manly Palmer (1928): , kapittel 14 Greek Oracles Harrison, Jane Ellen (1912): , kapittel IX, s. 329, angående drapet på Python. Kerenyi, Karl ([1951] 1980): , særlig s 135–136. Rohde, Erwin (1925): .