@BOOK{ Book!D - 77729079,
AUTHOR = "Piaget, Jean",
TITLE = "The child's conception of number",
LIBRARY= "کتابخانه مرکزی و مرکز اطلاع رسانی دانشگاه فردوسی مشهد",
SUBJECT = "، Child study,، Number concept",
URL = "/book/77729079/The-childs-conception-of-number/"}