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diff --git a/epistemology.bib b/epistemology.bib
index e618cb2..617ce03 100755
--- a/epistemology.bib
+++ b/epistemology.bib
@@ -192,3 +192,15 @@
   issue   = {1},
   doi     = {https://doi.org/10.5007/2175-8034.2021.e78405},
 }
+
+% Versions of this article appeared in the
+% Journal of Mathematical Behavior, Vol. 11, No.1, in March, 1992, pp. 3-33;
+% Constructionism, I. Harel & S. Papert, Eds. (Ablex Publishing Corporation, 1991), pp.161-191;
+% and SIGNS: Journal of Women in Culture and Society, Autumn 1990, Vol. 16 (1).
+@article{papert1990,
+  title   = {Epistemological Pluralism and the Revaluation of the Concrete},
+  author  = {Sherry Turkle and Seymour Papert},
+  year    = {1990},
+  journal = {SIGNS: Journal of Women in Culture and Society}
+  volume  = {16},
+}