Chisholm, G. (1975). Chisholm`s handbook of commercial Geography (19th.). Longman.
Lua i Stíl Chicago (17ú heag.)Chisholm, G. Chisholm`s Handbook of Commercial Geography. 19th. London: Longman, 1975.
Lua MLA (9ú heag.)Chisholm, G. Chisholm`s Handbook of Commercial Geography. 19th. Longman, 1975.
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