Bradley, David. Atlas of Languages of Intercultural Communication in the Pacific, Asia, and the Americas 1. Walter de Gruyter. 1996. ISBN 978-3-11-013417-9
(原始内容存档于2007-07-21). Human Development Report 2019 (PDF). UNITED NATIONS DEVELOPMENT PROGRAMME. [2019-12-22]. (原始内容 (PDF)存档于2020-01-18). Human Development Report 2019