(1993). Teach yourself with open learning / Derek Rowntree.
Chicago-čujuhus (17. p.)Teach Yourself with Open Learning / Derek Rowntree. 1993.
MLA-čujuhus (9. p.)Teach Yourself with Open Learning / Derek Rowntree. 1993.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.