diff --git a/main.bib b/main.bib
index 7d62326..a350124 100644
--- a/main.bib
+++ b/main.bib
@@ -321,6 +321,23 @@
   keywords = {morphology, allosemy},
 }
 
+@InBook{Sims2022a,
+  author   = {Sims, Andrea D and Ussishkin, Adam and Parker, Jeff and Wray, Samantha},
+  title    = {At the Intersection of Cognitive Processes and Linguistic Diversity},
+  pages    = {1--28},
+  crossref = {Sims2022},
+  file     = {:/home/noah/Documents/reading/morphology/Sims2022.pdf:PDF},
+  keywords = {morphology, typology},
+}
+
+@InBook{Haspelmath2019,
+  author   = {Haspelmath},
+  title    = {How comparative concepts and descriptive linguistic categories are different},
+  pages    = {83--114},
+  crossref = {Olmen2019},
+  keywords = {morphology, typology},
+}
+
 @Article{Aikhenvald1994,
   author       = {Aikhenvald, Alexandra Y.},
   date         = {1994},
@@ -3078,10 +3095,10 @@
 }
 
 @Book{Haspelmath2013,
-  author    = {Haspelmath, Martin and Sims, Andrea},
-  publisher = {Routledge},
-  title     = {Understanding morphology},
+  author    = {Haspelmath, Martin and Sims, Andrea D},
   date      = {2013},
+  title     = {Understanding morphology},
+  publisher = {Routledge},
   keywords  = {morphology},
 }
 
@@ -9803,6 +9820,37 @@ In this paper, I explore some questions about accommodation that often asked. Th
   keywords  = {morphology},
 }
 
+@Book{Sims2022,
+  date      = {2022},
+  title     = {Morphological Diversity and Linguistic Cognition},
+  doi       = {10.1017/9781108807951},
+  editor    = {Sims, Andrea D and Ussishkin, Adam and Parker, Jeff and Wray, Samantha},
+  publisher = {Cambridge University Press},
+  keywords  = {morphology, typology},
+}
+
+@Book{Olmen2019,
+  date      = {2019},
+  title     = {Aspects of Linguistic Variation},
+  doi       = {10.1515/9783110607963},
+  editor    = {van Olmen, Daniël and Mortelmans, Tanja and Brisard, Frank},
+  publisher = {De Gruyter Mouton},
+  series    = {Trends in Linguistics. Studies and Monographs [TiLSM]},
+  volume    = {324},
+  keywords  = {typology},
+}
+
+@Article{Corbett2015,
+  author       = {Corbett, Greville},
+  date         = {2015},
+  journaltitle = {Language},
+  title        = {Morphosyntactic Complexity},
+  number       = {1},
+  pages        = {145--193},
+  subtitle     = {A typology of lexical splits},
+  volume       = {91},
+}
+
 @Comment{jabref-meta: databaseType:biblatex;}
 
 @Comment{jabref-meta: grouping: