Inscription

lower left in plate: II-'50 / MCE; in artist's hand, lower left below image in graphite: M.C.Escher No5/2gII; in later hand, lower right in graphite: ORDER & CHAOS

Bibliography
1981
Bool, F.H. et al. M.C. Escher: His Life and Complete Graphic Work. Amsterdam: Meulenhoff, 1981; English-language edition, New York: Harry N. Abrams, 1982.