Unesco. Progress of literacy in various countries: A preliminary statistical study of available census data since 1900. Unesco.
Chicago Style aipamenaUnesco. Progress of Literacy in Various Countries: A Preliminary Statistical Study of Available Census Data Since 1900. Unesco.
MLA aipamenaUnesco. Progress of Literacy in Various Countries: A Preliminary Statistical Study of Available Census Data Since 1900. Unesco.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.