APA aipamena

HUBBARD, R. G. (2017). Economics. Pearson Education.

Chicago Style aipamena

HUBBARD, R. Glenn. Economics. Pearson Education, 2017.

MLA aipamena

HUBBARD, R. Glenn. Economics. Pearson Education, 2017.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.