Cita APA (7th ed.)

Union of International Associations. Yearbook of International Organizations 1981 (19.). Union of International Associations.

Cita Chicago (17th ed.)

Union of International Associations. Yearbook of International Organizations 1981. 19. Bruselas: Union of International Associations.

Cita MLA (9th ed.)

Union of International Associations. Yearbook of International Organizations 1981. 19. Union of International Associations.