This section or appendix lacks references or sources. Please help verify this information by adding appropriate citations. You can also discuss it at the Tea Room.
See Old Church Slavonic at Wikipedia for a thorough look at the sounds of Old Church Slavonic.
Todd B. Krause, Jonathan Slocum (2023 August 10 (last accessed)) “The Sound System”, in Old Church Slavonic Online[1], The University of Texas at Austin
David Huntley (1993) “Old Church Slavonic”, in Bernard Comrie, Greville G. Corbett, editors, The Slavonic Languages, Routledge, →ISBN, Phonology, pages 126–134