Mary AinsworthRobert S. Marvin, Frances W. Davidson, John M. Davidson · First published 2005Open the Tome
Spatial problem solving with Cuisenaire rodsPatricia S. Davidson, Robert E. Willcutt · First published 1983Open the Tome
The early windowRobert M. Liebert, Joyce N. Sprafkin, Emily S. Davidson, John M. Neale, Robert L. Liebert · First published 1978Open the Tome