Phyag rgya chen poʼi sṅon ʼgroʼi khrid yig gi sa bcad daṅ rtsa tshig zur khol du phyuṅ nas dran thor bkod pa : an outline with quotations elucidating the fundamental meaning of the preliminary instruction for the Mahamudra - Padma-chos-rgyal, ʼKhrul-źig, 1876-1958 ([s.n.], 1968)