Lua APA (7ú heag.)

Berk, R. (1974). Collective behaviour. W.M.C Brown Company.

Lua i Stíl Chicago (17ú heag.)

Berk, Richard. Collective Behaviour. NULL: W.M.C Brown Company, 1974.

Lua MLA (9ú heag.)

Berk, Richard. Collective Behaviour. W.M.C Brown Company, 1974.

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