مصادر الصور
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(1) Frick Collection, New York. The Yorck Project, DirectMedia/Wikipedia.
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(1–2) Alte Pinakothek, Munich. © TopFoto.
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(2–1) © G. E. Kidder Smith/Corbis.
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(2–2) Reproduced with permission from Donald E. Janzen.
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(2–3) New Lanark Trust.
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(2–4) © Iwasaki/Time and Life Pictures/Getty Images.
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(3–1) US National Archives.
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(4–1) Wikimedia.
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(4–2) © Eightfish/The Image Bank/Getty Images.
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(4–3) Chinua Achebe.
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(4–4) © Alan Davidson/Evening Standard/Getty Images.
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(5–1) Museum of Fine Arts, Houston, Texas. © The Granger Collection/TopFoto
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(5–2) Wikimedia.
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(6–1) © The Granger Collection/TopFoto.
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(6–2) © Keystone/Getty Images.
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(7–1) © National Portrait Gallery.
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(7–2) © Pelletier Micheline/Corbis Sygma.