Kimball, G. S. (1905). Kimball's business speller: Designed for use in commercial schools, academies, normal schools, high schools & the higher grades of the common schools. The Bobbs-Merrill Company.
Citace podle Chicago (17th ed.)Kimball, Gustavus Sylvester. Kimball's Business Speller: Designed for Use in Commercial Schools, Academies, Normal Schools, High Schools & the Higher Grades of the Common Schools. Indianapolis: The Bobbs-Merrill Company, 1905.
Citace podle MLA (8th ed.)Kimball, Gustavus Sylvester. Kimball's Business Speller: Designed for Use in Commercial Schools, Academies, Normal Schools, High Schools & the Higher Grades of the Common Schools. The Bobbs-Merrill Company, 1905.
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