An die Kameraden der Theosophischen Gesellschaft
- Das Theosophische Forum, Band I, No. 2, Februar 1930
- Links deutschsprachig
- Links in Englisch
- The Secret Doctrine (PDF eBooks)
- The Secret Doctrine (HTML version)
- The Secret Doctrine (complete scan original edition)
- .
- SD References Vol 1
- SD References Vol 2
- Bibliography to the References
- .
- The Secret Doctrine Index by John P. Van Mater
- An Invitation to The Secret Doctrine
- Secret Doctrine Commentary / Stanzas I-IV: Transactions of the Blavatsky Lodge