Petsche, J. J. M. (2015). Gurdjieff and music: The Gurdjieff/de Hartmann piano music and its esoteric significance. Leiden ; Boston: Brill.
استشهاد بنمط شيكاغوPetsche, Johanna J. M. Gurdjieff and Music: The Gurdjieff/de Hartmann Piano Music and Its Esoteric Significance. Leiden ; Boston: Brill, 2015.
MLA استشهادPetsche, Johanna J. M. Gurdjieff and Music: The Gurdjieff/de Hartmann Piano Music and Its Esoteric Significance. Leiden ; Boston: Brill, 2015.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.