Não informado. World population year bulletin. World Federation of United Nations Associations.
Style de citation Chicago (17e éd.)Não informado. World Population Year Bulletin. Geneva, Suíça: World Federation of United Nations Associations.
Style de citation MLA (8e éd.)Não informado. World Population Year Bulletin. World Federation of United Nations Associations.
Attention : ces citations peuvent ne pas être correctes à 100%.