PWE-V1Companion workbook for College Writing 2.1x, Principles of Written English, a free online writing course for English language students, offered by the University of California/Berkeley through edX.org.
http://www.edx.org/course/uc-berkeleyx/uc-berkeleyx-colwri2-2x-principles-1348

This workbook was written specifically for this course. It contains excerpts of the course material as well as extra writing materials. It is being provided for a low price of $ 2.99 US, by Wayzgoose Press.

Principles of Written English 1, http://www.smashwords.com/books/view/374174

Sometimes online stores such as Amazon charge an international surcharge if you are not in the USA. This is why we recommend Smashwords.com, which does not charge an extra fee. You can also use PayPal if you don’t have a credit card, or download your books in different formats.

It is also available at:

Amazon.com, http://www.amazon.com/Principles-Written-English-Workbook-1-ebook/dp/B00GET6R6M/

You need Kindle software to read this book, which is available: http://www.amazon.com/gp/feature.html/ref=sv_kstore_3?ie=UTF8&docId=1000493771

iTunes: https://itunes.apple.com/us/book/id737497397

Barnes & Noble: http://www.barnesandnoble.com/w/principles-of-written-english-workbook-1-maggie-sokolik/1117314632

Kobo: http://store.kobobooks.com/en-US/ebook/principles-of-written-english-workbook-1

Kobo requires special e-reader software. It is available at their website.