Vasconcelos Horta, Ines, and Margarida Alves Martins. “Invented Spelling Programmes and the Access to the Alphabetic Principle in Kindergarten”. L1-Educational Studies in Language and Literature, vol. 11, no. 1, Jan. 2012, pp. 1-23, doi:10.17239/L1ESLL-2011.01.01.