HUBBARD, R. G. (2017). Economics. Pearson Education.
Chicago-čujuhus (17. p.)HUBBARD, R. Glenn. Economics. Pearson Education, 2017.
MLA-čujuhus (9. p.)HUBBARD, R. Glenn. Economics. Pearson Education, 2017.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.