(1965). Source book for geography teaching. Unesco.
Chicago-čujuhus (17. p.)Source Book for Geography Teaching. London: Unesco, 1965.
MLA-čujuhus (9. p.)Source Book for Geography Teaching. Unesco, 1965.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.