Wattles, W. D. (1910). The science of getting rich. E. towne.
Lua i Stíl Chicago (17ú heag.)Wattles, Wallace Delois. The Science of Getting Rich. Holyoke, Mass.: E. towne, 1910.
Lua MLA (8ú heag.)Wattles, Wallace Delois. The Science of Getting Rich. E. towne, 1910.
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