Hagel J. (2005). Only Sustainable Edge. Harvard Business.
Chicago-čujuhus (17. p.)Hagel J. Only Sustainable Edge. Boston: Harvard Business, 2005.
MLA-čujuhus (9. p.)Hagel J. Only Sustainable Edge. Harvard Business, 2005.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.