Berkowitz Sol. (2017). New Approach to Sight Singing. W W Norton.
Chicago-čujuhus (17. p.)Berkowitz Sol. New Approach to Sight Singing. W W Norton, 2017.
MLA-čujuhus (9. p.)Berkowitz Sol. New Approach to Sight Singing. W W Norton, 2017.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.