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Author/Creator
- ebrary, Inc126
- ProQuest (Firm)72
- Piaget, Jean, 1896-198039
- Oxford University Press28
- SpringerLink (Online service)24
- Project Muse22
- Kagan, Jerome15
- Bushnell, Horace, 1802-187613
- Group Publishing11
- Harris, Paul L.10
- Saklofske, Donald H.10
- Singer, Dorothy G.10
- Fivush, Robyn9
- Golomb, Claire9
- Reynolds, Cecil R., 1952-9
- Sattler, Jerome M.9
- Siegler, Robert S.9
- Brainerd, Charles J.8
- Coles, Robert8
- Inhelder, Bärbel8