fix(data): Add citation information to prelim studies

02-data/processed/prelim/Ahumada2023.yml

@@ -1,3 +1,4 @@
+cite: Ahumada2023
 author: Ahumada, P. P.
 year: 2023
 title: "Trade union strength, business power, and labor policy reform: The cases of Argentina and Chile in comparative perspective"

02-data/processed/prelim/Alexiou2023.yml

@@ -1,3 +1,4 @@
+cite: Alexiou2023
 author: Alexiou, C., & Trachanas, E.
 year: 2023
 title: "The impact of trade unions and government party orientation on income inequality: Evidence from 17 OECD economies"

02-data/processed/prelim/Cardinaleschi2019.yml

@@ -1,3 +1,4 @@
+cite: Cardinaleschi2019
 author: Cardinaleschi, S., De Santis, S., & Schenkel, M.
 year: 2019
 title: "Effects of decentralised bargaining on gender inequality: Italy"

02-data/processed/prelim/Coutinho2006.yml

@@ -1,3 +1,4 @@
+cite: Coutinho2006
 author: Coutinho, M. J., Oswald, D. P., & Best, A. M.
 year: 2006
 title: "Differences in Outcomes for Female and Male Students in Special Education"

02-data/processed/prelim/Dieckhoff2015.yml

@@ -1,3 +1,4 @@
+cite: Dieckhoff2015
 author: Dieckhoff, M., Gash, V., & Steiber, N.
 year: 2015
 title: "Measuring the effect of institutional change on gender inequality in the labour market"

02-data/processed/prelim/Ferguson2015.yml

@@ -1,3 +1,4 @@
+cite: Ferguson2015
 author: Ferguson, J.-P.
 year: 2015
 title: "The control of managerial discretion: Evidence from unionization’s impact on employment segregation"

02-data/processed/prelim/Mukhopadhaya2003.yml

@@ -1,3 +1,4 @@
+cite: Mukhopadhaya2003
 author: Mukhopadhaya, P.
 year: 2003
 title: "Trends in income disparity and equality enhancing (?) education policies in the development stages of Singapore"

02-data/processed/prelim/Shin2006.yml

@@ -1,3 +1,4 @@
+cite: Shin2006
 author: Shin, J., & Moon, S.
 year: 2006
 title: "Fertility, relative wages, and labor market decisions: A case of female teachers"