Lua APA (7ú heag.)

Não informado. (1947). Contributions from Bears Bluff Laboratories. Bears Bluff Laboratories.

Lua i Stíl Chicago (17ú heag.)

Não informado. Contributions from Bears Bluff Laboratories. Wadmalaw Island, SC: Bears Bluff Laboratories, 1947.

Lua MLA (8ú heag.)

Não informado. Contributions from Bears Bluff Laboratories. Bears Bluff Laboratories, 1947.

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