Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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