APA-čujuhus (7. p.)
Garret, W. E. (1990). National Geographic: Vol. 177, no. 2, February 1990. National Geographic Society.
Chicago-čujuhus (17. p.)
Garret, Wilbur E. National Geographic: Vol. 177, No. 2, February 1990. Washington, EUA: National Geographic Society, 1990.
MLA-čujuhus (9. p.)
Garret, Wilbur E. National Geographic: Vol. 177, No. 2, February 1990. National Geographic Society, 1990.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.