Aus dem „Schlüssel zur Theosophie“
- Der Theosophische Pfad, Jahrgang XIV, Ausgabe 10-11
- Links deutschsprachig
- Links in Englisch
- The Secret Doctrine (PDF eBooks)
- The Secret Doctrine (HTML version)
- The Secret Doctrine (complete scan original edition)
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- SD References Vol 1
- SD References Vol 2
- Bibliography to the References
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- 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