Pennie, J. F. (1821). Ethel wolf, or, The Danish pirates: A tragedy in five acts. Whittaker.
Lua i Stíl Chicago (17ú heag.)Pennie, J. F. Ethel Wolf, or, The Danish Pirates: A Tragedy in Five Acts. London: Whittaker, 1821.
Lua MLA (8ú heag.)Pennie, J. F. Ethel Wolf, or, The Danish Pirates: A Tragedy in Five Acts. Whittaker, 1821.
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