Lua APA (7ú heag.)

Nigeria. Office of Statistics. Trade report. Federal Ministry of Information, Printing Division.

Lua i Stíl Chicago (17ú heag.)

Nigeria. Office of Statistics. Trade Report. Lagos: Federal Ministry of Information, Printing Division.

Lua MLA (8ú heag.)

Nigeria. Office of Statistics. Trade Report. Federal Ministry of Information, Printing Division.

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