Huggett, R. J. (1997). Environmental Change: The evolving ecosphere. Routledge.
Chicago-čujuhus (17. p.)Huggett, Richard John. Environmental Change: The Evolving Ecosphere. New York: Routledge, 1997.
MLA-čujuhus (9. p.)Huggett, Richard John. Environmental Change: The Evolving Ecosphere. Routledge, 1997.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.