updated

Author: zhouyisu

README.md

@@ -1,11 +1,15 @@
 # Globalization & Education
 Course slides are written in rmarkdown (`.rmd` file). It can be either viewed online in github or downloaded and opened with any text editor. The slides were rendered to html using [xaringan](https://github.com/yihui/xaringan). 
 
+## Content
+The first half of the course material is based on the textbook by Ritzer, G. nd Dean, P. (2015). _Globalization: A Basic Text._ Wiley-Blackwell, 2 edition. Though the actual delivery is heavily localized to meet my students' preferences. 
+
 ## View slides
 To view the slides as they were presented in class, visit:
 - 8/23 https://zhouyisu.github.io/globaled/session01
 - 8/27 https://zhouyisu.github.io/globaled/session02
 - 8/30 https://zhouyisu.github.io/globaled/session03
+- 9/03 https://zhouyisu.github.io/globaled/session04
 
 ## Print slides
 To print the handouts, use google Chrome's print function (e.g. `Ctrl + p` or `CMD + p`). Firefox or other browsers are not supported.