Matroska Multimedia Container (Partial draft). Sustainability of Digital Formats. Washington, D.C.: Library of Congress. 21 December 2015. Retrieved 13 December 2021.
Matroska v4 element specificationArchived 2018-02-04 at the Wayback Machine, Matroska.org. "TrackNumber: The track number as used in the Block Header (using more than 127 tracks is not encouraged, though the design allows an unlimited number)."
Matroska v4 element specificationArchived 2018-02-04 at the Wayback Machine, Matroska.org. "TrackNumber: The track number as used in the Block Header (using more than 127 tracks is not encouraged, though the design allows an unlimited number)."