Librería Samer Atenea
Librería Aciertas (Toledo)
Kálamo Books
Librería Perelló (Valencia)
Librería Elías (Asturias)
Donde los libros
Librería Kolima (Madrid)
Librería Proteo (Málaga)
First published in 1982, this work represents one of the first attempts to bring together the perspectives of a variety of different researchers investigating a specific, well defined content domain. It presents theoretical views and research findings investigating the early acquisition of addition and subtraction skills by young children.