"Lewis, Charles Bertrand". The House of Beadle & Adams and its Dime and Nickel Novels. University of Oklahoma Press. مؤرشف من الأصل في 2016-03-04. اطلع عليه بتاريخ 2019-04-20.
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"Lewis, Charles Bertrand". The House of Beadle & Adams and its Dime and Nickel Novels. University of Oklahoma Press. مؤرشف من الأصل في 2016-03-04. اطلع عليه بتاريخ 2019-04-20.