1. Assessing children's understanding of time, speed and distance interrelations;Acredolo,1989
2. The understanding of relative speeds, distances and durations of movement;Acredolo;Developmental Psychology,1981
3. The development of the concept of speed among Iraqi children;Al-Fakhri,1977
4. Foundations of information integration theory;Anderson,1981
5. Methods of information integration theory;Anderson,1982