"The Secret Doctrine" by H. P. Blavatsky

• The Secret Doctrine -- full text online
• Secret Doctrine Index -- compiled by John P. Van Mater
• Downloadable ASCII zip.file version of The Secret Doctrine in one file (1.6MB zipped; 4.4 MB unzipped)

Commentaries on The Secret Doctrine

• An Invitation to The Secret Doctrine
• "The 'Secret Doctrine' and Its Study" by Robert Bowen
• Secret Doctrine Commentary (Transactions of the Blavatsky Lodge) by H. P. Blavatsky
• Fountain-Source of Occultism by G. de Purucker -- detailed presentation of the philosophy of The Secret Doctrine
• Fundamentals of the Esoteric Philosophy by G. de Purucker -- examines the basic principles in The Secret Doctrine
• Studies in The Secret Doctrine: Headquarters Lodge from Studies in Occult Philosophy by G. de Purucker
• Archaic History of the Human Race by Gertrude W. van Pelt -- human evolution as outlined in The Secret Doctrine
• Sons of the Firemist: A Study of Man -- theosophical manual on human evolution as taught in the SD
• "Creation, Evolution, and the Secret Doctrine" by W. T. S. Thackara
• "History in a Different Light" by Sarah Belle Dougherty
• "The Secret Doctrine in the Light of 20th-Century Thought" by Jerry Hejka-Ekins

Historical and Informational Material

• "The Writing of 'The Secret Doctrine'" by Kirby Van Mater
• "Access to Great Ideas: The Secret Doctrine Reference Series" by Richard I. Rob
• "An Imaginary H.P.B. Library" by John P. Van Mater
• "The Eyes to See With: Working on 'The Secret Doctrine Index' " by Jim Belderis

Reference Works

Encyclopedic Theosophical Glossary

Collation of Theosophical Glossaries