Gareis, R. &. O. (2013). Project management and sustanable development principles. Project management institute.
Lua i Stíl Chicago (17ú heag.)Gareis, Ronald & Other. Project Management and Sustanable Development Principles. Pennsylvania: Project management institute, 2013.
Lua MLA (9ú heag.)Gareis, Ronald & Other. Project Management and Sustanable Development Principles. Project management institute, 2013.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.