Cita APA (7th ed.)

ALLRED, R. A., BAIRD, L. O., & READ, E. A. (1981). Keys to spelling mastery. The Economy Co.

Cita Chicago (17th ed.)

ALLRED, Ruel A., Louise O. BAIRD, i Edwin A. READ. Keys to Spelling Mastery. Oklahoma: The Economy Co, 1981.

Cita MLA (9th ed.)

ALLRED, Ruel A., et al. Keys to Spelling Mastery. The Economy Co, 1981.