(1962). Penrose annual: Review of the graphic arts. London: Lund Humphries & co., Ltd.
Čikaški stil citiranjaPenrose Annual: Review of the Graphic Arts. London: Lund Humphries & co., Ltd, 1962.
MLA način citiranjaPenrose Annual: Review of the Graphic Arts. London: Lund Humphries & co., Ltd, 1962.
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