Gurdjieff's Music for the Movements - Channel Classics Records
The Thomas de Hartmann Project
Thomas de Hartmann (Composer, Arranger) - Short Biography
Gurdjieff / De Hartmann: Complete Music for the Piano - YouTube
On Olga de Hartmann
Thomas de Hartmann Project - Home | Facebook
Thomas De Hartmann | Discography | Discogs
Olga und Thomas de Hartmann: Biografien | Chalice Verlag
The Thomas de Hartmann Project
Why Has Ukranian Composer Thomas de Hartmann Been So Neglected? : Interlude
Gurdjieff / De Hartmann: Complete Music for the Piano - Brilliant Classics
On Olga de Hartmann
Thomas De Hartmann music, videos, stats, and photos | Last.fm
Thomas De Hartmann | Light In The Attic Records
The Gurdjieff Legacy Foundation Archives
Hartmann's operation - Wikipedia
The Music Of Gurdjieff / De Hartmann | Light In The Attic Records
Thomas de Hartmann | Spotify
Catalogue of Compositions – The Thomas de Hartmann Project
Why Has Ukranian Composer Thomas de Hartmann Been So Neglected? : Interlude
Thomas de Hartmann
Thomas de Hartmann Project - Home | Facebook
PDF) Gurdjieff and Music: The Gurdjieff/de Hartmann Piano Music and its Esoteric Significance | Johanna Petsche - Academia.edu
Thomas de Hartmann (1885-1956) : "Rituals of a Sufi Order" piano (3 extracts) - YouTube
