Ashton, J. (1967). Economic change and agriculture. Oliver & Boyd.
Chicago-čujuhus (17. p.)Ashton, J. Economic Change and Agriculture. Edenburgh: Oliver & Boyd, 1967.
MLA-čujuhus (9. p.)Ashton, J. Economic Change and Agriculture. Oliver & Boyd, 1967.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.