Griffin, D. R. (1959). Echoes of bats and men. New York : Doubleday.
Lua i Stíl Chicago (17ú heag.)Griffin, Donald R. Echoes of Bats and Men. New York : Doubleday, 1959.
Lua MLA (9ú heag.)Griffin, Donald R. Echoes of Bats and Men. New York : Doubleday, 1959.
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