Beardshaw, J. (1992). Economics: A students guide (3.). ELBS.
Chicago Style aipamenaBeardshaw, John. Economics: A Students Guide. 3. London: ELBS, 1992.
MLA aipamenaBeardshaw, John. Economics: A Students Guide. 3. ELBS, 1992.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.