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.
A nice discussion of some important points needed by those callling to Islam
Source: http://www.islamhouse.com/p/1243
Ibn Katheer, At-Tabari, As-Syooti and Other Historians. The four Rightly guided Caliphs (Khaliph's) Abu Bakr As-Sideeq, Umar ibn Al-Khattaab, Uthmaan Ibn 'Affaan and Ali Ibn Abi Taalib. The Biography of Umar Ibn Abdel-Azeez who is regarded as one of the Rightly Guided Chaliphs is also included in this book.
Author: Imam Ibn Kathir
The testimony of "Laa ilaaha ill-Allah", its meaning, prerequisites, conditions, and fruits.
Author: Saleh Bin Fawzaan al-Fawzaan
Publisher: http://www.islammessage.com - Islam Message House Website
Source: http://www.islamhouse.com/p/1223
This is the first English translation of the book Sharh Hadeeth Maa Dhi'baan Jaai'aan… written by the great scholar Ibn Rafab al-Hanbalee (d.795H) in explanation of the prophet. An excellent book , warning us about the dangers of expending our energies in chasing after the transitory things of this world at the expense of the rewards of the Hereafter.
Author: Ibn Rajab Al-Hanbali
Translated from the original Arabic into English, provides a vivid insight into the moral conduct of the early Muslims in a society led by the perfect character of the Prophet Muhammad (pbuh) ('I was only sent to perfect good character'). The Prophet's Companions represent excellent examples of men of vigorous moral stature whose conduct inspired and attracted the masses to the fold of Islam wherever they went during the expansion of the Muslim territories, and contrary to the stereotypic portrayal, in the West, of Islam as being spread by the sword.
Author: Muhammad ibn Ismaeel al-Bukhari