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There was a time when people assumed that the world was flat. Once an alternate theory was proposed, however, that conceit was challenged and, eventually, disproved. In short, theories and ideas can be potent agents of change—none more so than those that are extensively detailed in this book.

APA
Kuiper, K. (Ed.), (2009). The Britannica Guide to Theories and Ideas That Changed the Modern World. Retrieved from https://eb.ipublishcentral.com/product/britannica-guide-to-theories-ideas-that-changed-modern-world

MLA
Kuiper, Kathleen. ed, The Britannica Guide to Theories and Ideas That Changed the Modern World. Chicago: Britannica Educational Publishing, 2009. EPUB. https://eb.ipublishcentral.com/product/britannica-guide-to-theories-ideas-that-changed-modern-world

Chicago
Kuiper, Kathleen. ed, The Britannica Guide to Theories and Ideas That Changed the Modern World. Chicago: Britannica Educational Publishing, 2009. EPUB. https://eb.ipublishcentral.com/product/britannica-guide-to-theories-ideas-that-changed-modern-world

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