These are three good books for learning Arabic Language for the non-native speakers. But we should pay your attention that they are for who has slightly good knowledge about Arabic and how to pronounce it. We don't claim that you can consider them as an alternative to a teacher but they are good step for who wants to be excellent at Arabic. With these books, there is an Arabic-English glossary confined to the words mentioned in these books, and the author shows in its introduction how to find any word.
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Author: Mane' Bin Hammad Al-Juhani
This is an advice from the previous Grand Mufti in Saudi Arabia in regard to Riba (usury) transactions that have proliferated in the recent times through the numerous financial institutions that have been established throughout the world.
Author: Abdul Aziz bin Abdullah bin Baz
Translators: Jalal Abualrub
A detailed description of the different ways the Prophet (s) advised people.
Author: Muhammad Salih Al-Munajjid
Publisher: Islamic Propagation Office in Rabwah
Source: http://www.islamhouse.com/p/1359
This book is one of the most important Islamic books which gives right answers about Christianity.
Author: Sheikh-ul-Islam ibn Taymiyyah
An explanation of the different situations in which one must make prostrations for forgetfulness and when to perform them.
Author: Muhammad ibn Saleh al-Othaimeen
Source: http://www.islamhouse.com/p/1373