Cita APA (7th ed.)

Wright, R. J., Martland, J., & Stafford, A. K. Early numeracy: Assessment for teaching and intervention (2a ed.).

Cita Chicago (17th ed.)

Wright, Robert J., Jim Martland, i Ann K. Stafford. Early Numeracy: Assessment for Teaching and Intervention. 2a ed.

Cita MLA (8th ed.)

Wright, Robert J., et al. Early Numeracy: Assessment for Teaching and Intervention. 2a ed.