| Author | Title | Source |
| Max Nordau | Degeneration - Book II - Chapter V: The Richard Wagner Cult |
The Wagner Library |
| Kriss Rusmanis | Great Composers: Wagner | The Wagner Library |
| Alan David Aberbach | Listening to Wagner | html |
| Florence Akin | Opera Stories from Wagner | HTML at Project Gutenberg |
| Bradley J. Birzer | "Both rings were round, and there the resemblance eases": Tolkien, Wagner, Nationalism and Modernity |
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| Edward L. Burlingame | Art Life and Theories of Richard Wagner | The Cornell University Library Historical Monographs |
| Houston Stewart Chamberlain | Das Drama Richard Wagner's | hschamberlain.net |
| Houston Stewart Chamberlain | Parsifal-Märchen | hschamberlain.net |
| Houston Stewart Chamberlain | Cosima Wagner und Houston Stewart Chamberlain im Briefwechsel 1888-1908 | hschamberlain.net |
| Donald H. Crosby | Beyond Analysis: Richard Wagner's Tristan und Isolde | HTML at The Wagner Society of Washington DC |
| Allen B. Dunning | The Musical Themes of Der Ring des Nibelungen | HTML at allenbdunningmd.com |
| William Henry Frost | The Wagner Story Book: Firelight Tales of the Great Music Dramas | Project Gutenberg Etext |
| Thomas Grey | The return of the prodigal son: Richard Wagner and Der Fliegende Holländer | PDF at cambridge.org |
| George Ainslie Hight | Wagner's Tristan und Isolde | HTML at Project Gutenberg |
| Franz Liszt | Letters of Franz Liszt. | |
| Volume 1: From Paris to Rome | Project Gutenberg Etext | |
| Volume 2: From Rome to the End | Project Gutenberg Etext | |
| Peter Nicholson | Orpheus Ascending: A reassessment of Wagner and Wagnerism | the Wagner Society in New South Wales |
| Friedrich Nietzsche | The Birth of Tragedy | The Nietzsche Channel |
| Friedrich Nietzsche | Richard Wagner in Bayreuth | The Nietzsche Channel |
| Friedrich Nietzsche | The Case of Wagner | The Nietzsche Channel |
| Friedrich Nietzsche | Nietzsche Contra Wagner | The Nietzsche Channel |
| Alex Ross | THE RING AND THE RINGS - Wagner vs. Tolkien | HTML at The New Yorker |
| John F. Runciman | Wagner | HTML at Project Gutenberg |
| John F. Runciman | Richard Wagner, Composer of Operas | HTML at Project Gutenberg |
| Hal Sarf | Wagner's Transfiguration: Schopenhauer And The Origin Of Tristan und Isolde | Center for Humanities and Contemporary Culture |
| George Bernard Shaw | The Perfect Wagnerite | Project Gutenberg Etext |
| Derek Strahan | Was Wagner Jewish? | HTML |
| Helmut Walther | Nietzsche and Wagner | HTML at virtusens.de |
| Simon Weil | Wagner and the Jews | HTML |