diff --git a/anger-references.bib b/anger-references.bib
index d543476..7c19938 100644
--- a/anger-references.bib
+++ b/anger-references.bib
@@ -28,6 +28,22 @@ @incollection{matsuki_1995
 	pages = {137--151},
 }
 
+@article{levenson_emotion_1992,
+	title = {Emotion and autonomic nervous system activity in the {Minangkabau} of {West} {Sumatra}},
+	volume = {62},
+	issn = {1939-1315},
+	doi = {10.1037/0022-3514.62.6.972},
+	abstract = {Physiology and emotional experience were studied in the Minangkabau of West Sumatra, a matrilineal, Moslem, agrarian culture with strong proscriptions against public displays of negative emotion. 46 Minangkabau men were instructed to contract facial muscles into prototypical configurations of 5 emotions. In comparison with a group of 62 men from the US, cross-cultural consistencies were found in (1) autonomic nervous system (ANS) differences between emotions and (2) high configuration quality being associated with increased ANS differentiation and increased report of emotional experience. These findings provide the first evidence that these patterns of emotion-specific ANS activity and the capacity of voluntary facial action to generate this activity are not unique to American culture. (PsycINFO Database Record (c) 2016 APA, all rights reserved)},
+	number = {6},
+	journal = {Journal of Personality and Social Psychology},
+	author = {Levenson, Robert W. and Ekman, Paul and Heider, Karl and Friesen, Wallace V.},
+	year = {1992},
+	note = {Place: US
+Publisher: American Psychological Association},
+	keywords = {Emotions, Autonomic Nervous System, Physiological Correlates},
+	pages = {972--988},
+}
+
 @article{hilpert_distinctive_2006,
 	title = {Distinctive collexeme analysis and diachrony},
 	volume = {2},