Keene, C. (1972). The clue in the old stagecoach. William Collins Sons and Co. Ltd..
Tohutoru Kātū Chicago (17th ed.)Keene, Carolyn. The Clue in the Old Stagecoach. Great Britain: William Collins Sons and Co. Ltd., 1972.
Tohutoro MLA (9th ed.)Keene, Carolyn. The Clue in the Old Stagecoach. William Collins Sons and Co. Ltd., 1972.
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