Johannes Brahms: Life and Letters, ISBN 0-19-816234-0 by Brahms himself, edited by Styra Avins, translated by Josef Eisinger (1998). A biography by way of comprehensive footnotes to a comprehensive collection of Brahms's letters (some translated into English for the first time). Elucidates some previously contentious matters, such as Brahms's reasons for declining the Cambridge invitation.
Brahms, His Life and Work, by Karl Geiringer, photographs by Irene Geiringer (1987, ISBN 0-306-80223-6). A biog and discussion of his musical output, supplemented by, and cross-referenced with, the body of correspondence sent to Brahms.
Charles Rosen discusses a number of Brahms's imitations of Beethoven in Chapter 9 of his Critical Entertainments: Music Old and New (2000; Cambridge, MA: Harvard University Press, ISBN 0-674-17730-4).
Brahms by Malcolm MacDonald is a biography and also discussion of virtually everything Brahms composed, along with chapters examining his position in Romantic music, his devotion to Early Music, and his influence on later composers. (Dent 'Master Musicians' series, 1990; 2nd edition Oxford, 2001, ISBN 0-19-816484-X
Johannes Brahms: A Biography, by Jan Swafford. A comprehensive (752 pages) look at the life and works of Brahms. (1999; Vintage, ISBN 0-679-74582-3)
Late Idyll: The Second Symphony of Johannes Brahms, by Reinhold Brinkmann, translated by Peter Palmer. An analysis of Symphony No.2 and meditation of its position in Brahms's career and in relation to 19th century ideas of melancholy. (1995, Harvard, ISBN 0-674-51175-1)
Johannes Brahms, His Work & Personality, by Hans Gal (Translated by Joseph Stein). Wiedenfeld & Nicolson, 1963.
The Music of Brahms, by Michael Musgrave. Oxford, 1985 ISBN 0-19-816401-7
Wolfgang Sandberger: Brahms-Handbuch, Stuttgart: Metzler; Kassel: Bärenreiter, 2009, ISBN 978-3-476-02233-2
Peter Schmitz (2009). Johannes Brahms und der Leipziger Musikverlag Breitkopf und Härtel (Abhandlungen Zur Musikgeschichte). V&R unipress. ISBN978-3-89971-728-0.
