Lua APA (7ú heag.)
Robèrt, K. (2002). The natural step story: Seeding a quiet revolution. New Society Publishers.
Lua i Stíl Chicago (17ú heag.)
Robèrt, Karl-Henrik. The Natural Step Story: Seeding a Quiet Revolution. Gabriola Island, B.C.: New Society Publishers, 2002.
Lua MLA (9ú heag.)
Robèrt, Karl-Henrik. The Natural Step Story: Seeding a Quiet Revolution. New Society Publishers, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.