DICTIONARY OF ECOLOGY AND ENVIRONMENT.
Chicago-čujuhus (17. p.)DICTIONARY OF ECOLOGY AND ENVIRONMENT.
MLA-čujuhus (9. p.)DICTIONARY OF ECOLOGY AND ENVIRONMENT.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.
APA-čujuhus (7. p.)