Encyclopaedia Britannica & 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 (Unabridged.). [s.l.].
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)Encyclopaedia Britannica và George Donald Hudson. 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. Unabridged. Chicago: [s.l.], 1952.
Trích dẫn kiểu MLA (xuất bản lần thứ 9)Encyclopaedia Britannica và George Donald Hudson. 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. Unabridged. [s.l.], 1952.