Cita APA (7a ed.)

Skowronek, H., & Marx, H. (1989). The Bielefeld longitudinal study on early identification of risks in learning read and write: Theoretical background and first results. Children at risk, 268-294.

Cita Chicago Style (17a ed.)

Skowronek, Helmut, y Harald Marx. "The Bielefeld Longitudinal Study on Early Identification of Risks in Learning Read and Write: Theoretical Background and First Results." Children at Risk 1989: 268-294.

Cita MLA (9a ed.)

Skowronek, Helmut, y Harald Marx. "The Bielefeld Longitudinal Study on Early Identification of Risks in Learning Read and Write: Theoretical Background and First Results." Children at Risk, 1989, pp. 268-294.