Pepper, D. (1997). Modern environmentalism: An introduction. Routledge.
Chicago-čujuhus (17. p.)Pepper, David. Modern Environmentalism: An Introduction. --New York: Routledge, 1997.
MLA-čujuhus (9. p.)Pepper, David. Modern Environmentalism: An Introduction. Routledge, 1997.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.