Feat: adds @whitehead1979, @schuhmann2004, @piaget1999, @piaget1998

1 files changed, 22 insertions, 0 deletions

diff --git a/psychology.bib b/psychology.bib
index 0c7f994..11df6d4 100755
--- a/psychology.bib
+++ b/psychology.bib
@@ -123,3 +123,25 @@
   publisher = {Originally published in New York by Teachers College, Columbia University.},
   url       = {http://psychclassics.yorku.ca/Ebbinghaus/},
 }
+
+@book{piaget1999,
+  title     = {Psychology of Intelligence (Routledge Classics)},
+  author    = {Jean Piaget},
+  publisher = {},
+  isbn      = {9780415210065,9780415254014,0415210062,0415254019},
+  year      = {1999},
+  series    = {},
+  edition   = {2nd Revised edition},
+  volume    = {},
+}
+
+@book{piaget1998,
+  title     = {Language and Thought of the Child},
+  author    = {Jean Piaget},
+  publisher = {},
+  isbn      = {9780203992739,9780415169332,9781443724364,9786610281848,0203992733,041516933X,144372436X,661028184X},
+  year      = {1998},
+  series    = {},
+  edition   = {4},
+  volume    = {},
+}