American Geological Institute. (1972). Investigating the earth. Houghton Mifflin.
Chicago-čujuhus (17. p.)American Geological Institute. Investigating the Earth. New York: Houghton Mifflin, 1972.
MLA-čujuhus (9. p.)American Geological Institute. Investigating the Earth. Houghton Mifflin, 1972.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.