Robertson, M. (2014). Sustainability: Principles and practice. Routledge.
Chicago-čujuhus (17. p.)Robertson, Margaret. Sustainability: Principles and Practice. New York: Routledge, 2014.
MLA-čujuhus (9. p.)Robertson, Margaret. Sustainability: Principles and Practice. Routledge, 2014.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.