Luelsdorff, P. (1991). Developmental orthography. John Benjamins Pub. Co..
Cita Chicago (17th ed.)Luelsdorff, Philip. Developmental Orthography. Amsterdam: John Benjamins Pub. Co., 1991.
Cita MLA (9th ed.)Luelsdorff, Philip. Developmental Orthography. John Benjamins Pub. Co., 1991.
Atenció: Aquestes cites poden no estar 100% correctes.