Knox, J. (1893). The butler detective: Or, Old Grip's grip. Beadle & Adams.
Lua i Stíl Chicago (17ú heag.)Knox, Jackson. The Butler Detective: Or, Old Grip's Grip. New York: Beadle & Adams, 1893.
Lua MLA (8ú heag.)Knox, Jackson. The Butler Detective: Or, Old Grip's Grip. Beadle & Adams, 1893.
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