-. (1989). Nature's wonderlands: National park of the world. National geography society.
Chicago-čujuhus (17. p.)-. Nature's Wonderlands: National Park of the World. Washington: National geography society, 1989.
MLA-čujuhus (9. p.)-. Nature's Wonderlands: National Park of the World. National geography society, 1989.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.