KIRK GEOFFREY. (1982). SCHUMACHER ON ENERGY. JONATHAN CAPE.
Chicago-čujuhus (17. p.)KIRK GEOFFREY. SCHUMACHER ON ENERGY. LONDON: JONATHAN CAPE, 1982.
MLA-čujuhus (9. p.)KIRK GEOFFREY. SCHUMACHER ON ENERGY. JONATHAN CAPE, 1982.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.