APA-čujuhus (7. p.)
Allen, W. L. National Geographic: Vol. 200, no. 4, October 2001. National Geographic Society.
Chicago-čujuhus (17. p.)
Allen, William L. National Geographic: Vol. 200, No. 4, October 2001. Washington, EUA: National Geographic Society.
MLA-čujuhus (9. p.)
Allen, William L. National Geographic: Vol. 200, No. 4, October 2001. National Geographic Society.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.