Citace podle APA (7th ed.)
(1981). The 1981 world book year book.: The annual supplement to the world book encyclopedia (ed.). World book- childcraft international, Inc..
Citace podle Chicago (17th ed.)
The 1981 World Book Year Book.: The Annual Supplement to the World Book Encyclopedia. ed. Chicago: World book- childcraft international, Inc., 1981.
Citace podle MLA (9th ed.)
The 1981 World Book Year Book.: The Annual Supplement to the World Book Encyclopedia. ed. World book- childcraft international, Inc., 1981.
Upozornění: Tyto citace jsou generovány automaticky. Nemusí být zcela správně podle citačních pravidel..