diff --git a/pages/Sigman___Dos marchando juntos.md b/pages/Sigman___Dos marchando juntos.md
index d9d36b8..7b3a0a7 100644
--- a/pages/Sigman___Dos marchando juntos.md	
+++ b/pages/Sigman___Dos marchando juntos.md	
@@ -67,5 +67,7 @@
 		  logseq.order-list-type:: number
 		- Cicerón, M. T. (2020). *Sobre la amistad. Laelius de amicitia*. España: Editorial Verbum.
 		  logseq.order-list-type:: number
+		- Ross, M., & Sicoly, F. (1979). Egocentric biases in availability and attribution. Journal of personality and social psychology, 37(3), 322.
+		  logseq.order-list-type:: number
 		- logseq.order-list-type:: number
 -
\ No newline at end of file