APA-čujuhus (7. p.)

American Petroleum Institute API. Adventures in energy.

Chicago-čujuhus (17. p.)

American Petroleum Institute API. Adventures in Energy.

MLA-čujuhus (9. p.)

American Petroleum Institute API. Adventures in Energy.

Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.