Lib.ru (Maksim Moshkow's Library): While primarily text-based, it is a reliable source for the full manuscript of the Russian translation.

Royallib.com: A popular library where you can find the biography in multiple formats, including fb2, epub, and pdf.

The book (often referred to in Russian as "Иоахим Фест. Адольф Гитлер" ) by Joachim Fest is one of the most famous and comprehensive biographies of the German dictator.

KupitKnigu (Audio/E-book): For high-quality, edited digital versions, LitRes offers the three-volume set.