APA aipamena

FRYER, D. World economic development. McGraw-Hill Book Company.

Chicago Style aipamena

FRYER, D.W. World Economic Development. McGraw-Hill Book Company.

MLA aipamena

FRYER, D.W. World Economic Development. McGraw-Hill Book Company.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.