Problem solving in arithmetic : a study of certain factors in the allocation of arithmetic problems involving one, two, three, and four steps or processes in reasoning /
Neulen, Leon Nelson,1894-
Columbia University.Teachers College.Bureau of Publications.
New York City : Bureau of Publications, Teachers College, Columbia University,
1931.
Published also as thesis (PH. D.) Columbia university.
Bibliography: p. 72-74.
Arithmetic