(1997). Fundamintals of the Physical environment. Routledge.
Chicago-čujuhus (17. p.)Fundamintals of the Physical Environment. London: Routledge: Routledge, 1997.
MLA-čujuhus (9. p.)Fundamintals of the Physical Environment. Routledge, 1997.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.