Cita APA (7th ed.)
(1979). The 1979 world book year book.: The annual supplement to the world book encyclopedia (ed.). World book- childcraft international, Inc..
Cita Chicago (17th ed.)
The 1979 World Book Year Book.: The Annual Supplement to the World Book Encyclopedia. ed. Chicago: World book- childcraft international, Inc., 1979.
Cita MLA (9th ed.)
The 1979 World Book Year Book.: The Annual Supplement to the World Book Encyclopedia. ed. World book- childcraft international, Inc., 1979.
Atenció: Aquestes cites poden no estar 100% correctes.