Martindale, C. C. (1955). The castle and the ring. Kenedy.
Lua i Stíl Chicago (17ú heag.)Martindale, C. C. The Castle and the Ring. New York: Kenedy, 1955.
Lua MLA (8ú heag.)Martindale, C. C. The Castle and the Ring. Kenedy, 1955.
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