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William Matthews, Getting On in the World, p. 204.

Irvin Wyllie, The Self-Made Man in America, ch. 7 to Epilogue.

Paul and Sarah Edwards, Secrets of Successful Self-Employment.

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Business owners are the most frequent of all high-income groups to give credit for their success to their willingness to take financial risk. Senior corporate executives are in second place, followed by physicians… (Thomas J. Stanley, The Millionaire Mind, p. 161).