Cramer, R. L. (1978). Spelling: Words and skills. Scott, Foresman.
Lua i Stíl Chicago (17ú heag.)Cramer, Ronald L. Spelling: Words and Skills. Scott, Foresman, 1978.
Lua MLA (9ú heag.)Cramer, Ronald L. Spelling: Words and Skills. Scott, Foresman, 1978.
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