Whaley, N. M. (1923). The natural speller. The Bobbs-Merrill Company, Publishers.
Lua i Stíl Chicago (17ú heag.)Whaley, N. M. The Natural Speller. Indianapolis: The Bobbs-Merrill Company, Publishers, 1923.
Lua MLA (8ú heag.)Whaley, N. M. The Natural Speller. The Bobbs-Merrill Company, Publishers, 1923.
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