*[Alef Language Reference Manual](http://doc.cat-v.org/plan_9/2nd_edition/papers/alef/ref)
### Android
*[Agile Android Software Development](http://www.agiledroid.com)(PDF, epub, mobi - need email confirmation) by Etienne Savard
*[Android 4 App Development Essentials](http://www.techotopia.com/index.php/Android_4_App_Development_Essentials)
*[Android Programming Guide for Beginners](http://eduonix.com/offers/Android_ebook_free_offer.html)(PDF - need email confirmation)
*[Android Programming Succinctly, Syncfusion](https://www.syncfusion.com/resources/techportal/ebooks/android)([PDF](https://www.syncfusion.com/content/downloads/ebook/Android_Programming_Succinctly.pdf), [Kindle](https://www.syncfusion.com/content/downloads/ebook/Android_Programming_Succinctly.mobi)) *(Just fill the fields with any values)*
