Geology Rocks Soil {Express Edition}. Raintree Publishers.
Chicago-čujuhus (17. p.)Geology Rocks Soil {Express Edition}. Raintree Publishers.
MLA-čujuhus (9. p.)Geology Rocks Soil {Express Edition}. Raintree Publishers.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.