@incollection{:/content/books/9789210582001c002, author = "United Nations Department of Economic and Social Affairs", title = "Foreword", booktitle = "United Nations Demographic Yearbook 1971", publisher = "United Nations", year = "1972", pages = "6-6", url = "https://www.un-ilibrary.org/content/books/9789210582001c002" }