Lo, B. (2010). GPS and geocaching in education (First edition.). International Society for Technology in Education.
Chicago-čujuhus (17. p.)Lo, Burt. GPS and Geocaching in Education. First edition. Eugene, Oregon: International Society for Technology in Education, 2010.
MLA-čujuhus (9. p.)Lo, Burt. GPS and Geocaching in Education. First edition. International Society for Technology in Education, 2010.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.