(1994). IGBP in Action: Work Plan 1994 - 1998. International Geosphere-Biosphere Programme (IGBP).
Chicago-čujuhus (17. p.)IGBP in Action: Work Plan 1994 - 1998. Stockholm: International Geosphere-Biosphere Programme (IGBP), 1994.
MLA-čujuhus (9. p.)IGBP in Action: Work Plan 1994 - 1998. International Geosphere-Biosphere Programme (IGBP), 1994.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.