Fenchel, T. (1987). Ecology-potentials and limitations. Ecology Institute.
Chicago-čujuhus (17. p.)Fenchel, Tom. Ecology-potentials and Limitations. Berlín: Ecology Institute, 1987.
MLA-čujuhus (9. p.)Fenchel, Tom. Ecology-potentials and Limitations. Ecology Institute, 1987.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.