Cramer, R. L. (1978). Spelling: Words and skills. Scott, Foresman.
Cita Chicago (17th ed.)Cramer, Ronald L. Spelling: Words and Skills. Scott, Foresman, 1978.
Cita MLA (9th ed.)Cramer, Ronald L. Spelling: Words and Skills. Scott, Foresman, 1978.
Atenció: Aquestes cites poden no estar 100% correctes.