APA-čujuhus (7. p.)
Robèrt, K. (2002). The natural step story: Seeding a quiet revolution. New Society Publishers.
Chicago-čujuhus (17. p.)
Robèrt, Karl-Henrik. The Natural Step Story: Seeding a Quiet Revolution. Gabriola Island, B.C.: New Society Publishers, 2002.
MLA-čujuhus (9. p.)
Robèrt, Karl-Henrik. The Natural Step Story: Seeding a Quiet Revolution. New Society Publishers, 2002.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.