Idee In The art of Thought (1926), Wallas elabora la celeberrima distinzione del processo creativo in quattro fasi: Preparazione, Incubazione, Illuminazione e Verifica.
Lavori 1889, Property under Socialism in Fabian Essays 1897, Life of Francis Place 1908, Human Nature in Politics 1914, The Great Society 1921, Our Social Heritage 1926, The art of Thought 1934, Social Judgement 1940, Men and Ideas, recueil d'articles avec une préface de Gilbert Murray
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