[en] The Twentieth Century · A People's History HarperCollins e-books
[en] [Gutenberg 47781] • Main Currents in Nineteenth Century Literature - 2. The Romantic School in Germany Kessinger Publishing
[en] [Gutenberg 47675] • Main Currents in Nineteenth Century Literature - 1. The Emigrant Literature Adamant Media Corporation
[en] [Gutenberg 49999] • Eminent Authors of the Nineteenth Century: Literary Portraits THOMAS Y. CROWELL & CO.
[en] [Gutenberg 44703] • The Eighteen Christian Centuries Transcript
[en] [Very Short Introductions 024] • Twentieth-Century Britain Oxford University Press, USA
[en] Who's who in twentieth-century literature McGraw-Hill Companies