diff --git a/02_data_science_defined.Rmd b/02_data_science_defined.Rmd
index e51802d..51f65c1 100644
--- a/02_data_science_defined.Rmd
+++ b/02_data_science_defined.Rmd
@@ -39,6 +39,9 @@ Tim Davies and Mark Frank (2013) [‘There’s no such thing as raw data’. Exp
 
 * [alternate source 2](http://students.ecs.soton.ac.uk/mwra1g13/msc/comp6037/timed_ex_pdf/p75-davies.pdf)
 
+
+Bertrand Russell, "The Social Responsibilities of Scientists" [@10.2307/1705325]
+
 ***
 
 ## Using R for Data Science
diff --git a/19_data_databases.Rmd b/19_data_databases.Rmd
index 9f27852..3d06cc7 100644
--- a/19_data_databases.Rmd
+++ b/19_data_databases.Rmd
@@ -11,6 +11,21 @@
 Ben Baumer (2019) "A Grammar for Reproducible and Painless Extract-Transform-Load Operations on Medium Data", _Journal of Computational and Graphical Statistics_ [@Baumer_2019]
 
 
+## SQL
+
+
+[SQL learning resources](https://twitter.com/ebovee09/status/1275070663452004359?s=20) -- twitter thread
+
+Irene Steves, [Using SQL in RStudio](https://irene.rbind.io/post/using-sql-in-rstudio/)
+
+[_Select Star SQL_](https://selectstarsql.com/)--"This is an interactive book which aims to be the best place on the internet for learning SQL."
+
+[SQL Tutorial](https://www.w3schools.com/sql/)--from w3schools.com
+
+[Learn SQL](https://www.codecademy.com/learn/learn-sql)--codeacademy.com course
+
+
+
 ## APIs
 
 Shana Pearlman (2016-09-07), [What are APIs and how do APIs work?](https://blogs.mulesoft.com/biz/tech-ramblings-biz/what-are-apis-how-do-apis-work/)
diff --git a/book.bib b/book.bib
index 2ec923b..247da0f 100644
--- a/book.bib
+++ b/book.bib
@@ -225,6 +225,15 @@ @Book{Friendly_Meyer_2016
 
 
 
+@Book{Gandrud_2015,
+  title = {Reproducible Research with R and R Studio (Second Edition)},
+  author = {Christopher Gandrud},
+  publisher = {Chapman and Hall/CRC},
+  year = {2015},
+  isbn = {ISBN 9781498715379}
+}
+
+
 @Book{Gelman_etal_2014,
   title = {Bayesian Data Analysis (Third Edition)},
   author = {Andrew Gelman, John B. Carlin,
@@ -236,6 +245,7 @@ @Book{Gelman_etal_2014
 }
 
 
+
 @Book{Gillespie_Lovelace_2017,
   title = {Efficient R Programming: A Practical Guide to Smarter Programming},
   author = {Colin Gillespie and Robin Lovelace},
@@ -352,6 +362,14 @@ @Book{Long_Teetor_2019
 }
 
 
+@Book{McCallum_2012,
+  title = {Bad Data Handbook: Cleaning Up The Data So You Can Get Back To Work},
+  author = {O. Ethan McCallum},
+  publisher = {O'Reilly},
+  year = {2012},
+  isbn = {ISBN 9781449321888}
+}
+
 
 @Book{McElreath_2016,
   title = {Statistical Rethinking: A Bayesian Course with Examples in R and Stan},
@@ -490,6 +508,19 @@ @article{Rougier_etal_2014
   url = {https://journals.plos.org/ploscompbiol/article?id=10.1371/journal.pcbi.1003833}
   }
 
+@article{10.2307/1705325,
+ ISSN = {00368075, 10959203},
+ URL = {http://www.jstor.org/stable/1705325},
+ author = {Bertrand Russell},
+ journal = {Science},
+ number = {3398},
+ pages = {391--392},
+ publisher = {American Association for the Advancement of Science},
+ title = {The Social Responsibilities of Scientists},
+ volume = {131},
+ year = {1960}
+}
+
 
 
 
@@ -528,6 +559,15 @@ @online{Smith_reproducible_2017
 }
 
 
+@Book{Squire_2015,
+  title = {Clean Data: Data Science Strategies for Tackling Dirty Data},
+  author = {Megan Squire},
+  publisher = {Packt Publishing},
+  year = {2015},
+  isbn = {ISBN 9781785284014}
+}
+
+
 
 @incollection{Sweeney_2001,
   author = {Latanya Sweeney},
@@ -556,6 +596,8 @@ @article{Sweeney_etal_2018
 }
 
 
+
+
 @article{R-tidytext,
   doi = {10.21105/joss.00037},
   url = {http://dx.doi.org/10.21105/joss.00037},