Evans, Arthur J.: The Palace of Minos: a comparative account of the successive stages of the early Cretan civilization as illustred by the discoveries at Knossos (Band 3): The great transitional age in the northern and eastern sections of the Palace (London, 1930)

Fig. 216. Sketch of South Portico of Central Section of 'Hall of the Double
Axes ' with Upper Elements removed ; showing Second Flight of Private Staircase
from ' Queen's Megaron ' beyond.