(2015). one step ahead: Towards environmental sustainability. united nation.
Lua i Stíl Chicago (17ú heag.)One Step Ahead: Towards Environmental Sustainability. cairo: united nation, 2015.
Lua MLA (9ú heag.)One Step Ahead: Towards Environmental Sustainability. united nation, 2015.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.