Millar, Susanna. The psychology of play. [electronic resource] . — Repr. [d. Ausg.] 1968.. — Harmondsworth : : Penguin Books,, 1975.. — 288 S. - Pelican books. Literaturverz. S. [257] - 281. ISBN: 0140209743 9780140209747 Standard No.: BIST296029