Hudson, G. D. (1952). Encyclopaedia Britannica world atlas: World distributions and world political geography, political-physical maps, geographical summaries, geographical comparisons, glossary of geographical terms, index to political-physical maps. s.n.
Chicago-viite (17. p.)Hudson, George Donald. Encyclopaedia Britannica World Atlas: World Distributions and World Political Geography, Political-physical Maps, Geographical Summaries, Geographical Comparisons, Glossary of Geographical Terms, Index to Political-physical Maps. Chicago: s.n, 1952.
MLA-viite (9. p.)Hudson, George Donald. Encyclopaedia Britannica World Atlas: World Distributions and World Political Geography, Political-physical Maps, Geographical Summaries, Geographical Comparisons, Glossary of Geographical Terms, Index to Political-physical Maps. s.n, 1952.