Cita APA (7th ed.)
Sheldon, C., & Yoxon, M. Environmental Management Systems: A Step-By-Step Guide to Implementation and Maintenance (3a edición.). Earthscan.
Cita Chicago (17th ed.)
Sheldon, Christopher, i Mark Yoxon. Environmental Management Systems: A Step-By-Step Guide to Implementation and Maintenance. 3a edición. Londres, Inglaterra: Earthscan.
Cita MLA (9th ed.)
Sheldon, Christopher, i Mark Yoxon. Environmental Management Systems: A Step-By-Step Guide to Implementation and Maintenance. 3a edición. Earthscan.
Atenció: Aquestes cites poden no estar 100% correctes.