APA (7th ed.) Zitazioa
(1988). The 1988 world book year book.: The annual supplement to the world book encyclopedia (ed.). World book, Inc..
Chicago Style (17th ed.) Zitazioa
The 1988 World Book Year Book.: The Annual Supplement to the World Book Encyclopedia. ed. Chicago: World book, Inc., 1988.
MLA (9th ed.) Zitazioa
The 1988 World Book Year Book.: The Annual Supplement to the World Book Encyclopedia. ed. World book, Inc., 1988.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.