Lua APA (7ú heag.)

PETERSON, H. C. Business and goverment. Harper & Row Publicatons.

Lua i Stíl Chicago (17ú heag.)

PETERSON, H. Craig. Business and Goverment. Harper & Row Publicatons.

Lua MLA (8ú heag.)

PETERSON, H. Craig. Business and Goverment. Harper & Row Publicatons.

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