O'Donnell, G. E. (1971). One Hundred Years at Overbrook, 1871-1971. Philadelphia.
Lua i Stíl Chicago (17ú heag.)O'Donnell, George Edward. One Hundred Years at Overbrook, 1871-1971. Philadelphia, 1971.
Lua MLA (8ú heag.)O'Donnell, George Edward. One Hundred Years at Overbrook, 1871-1971. Philadelphia, 1971.
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