Below are the most reliable books besides the Bible. These books will give you a better insight into Bible truths, for 'as the end approaches and the work of giving the world the final warning expands, it becomes more and more important for those who accept the present truth to have a clear understanding of the nature and influence of the Testimonies which God in His providence has connected with it from the very beginning (December 1844) of the third angel's message.' 5 Get. p. 531
General comment;
The "Spirit of Prophecy" books, written by the prophetess of God, are divided into several groups, namely from G1, G2 and G3 etc... These have been fully translated and or made electronic with the necessary corrections.
You can use these books in the Bible studies, Worship Services and Prophet Schools of HIS Message.
You will also find certain quotes from the series "Testimonies for the Church" (these books have not yet been fully translated and are therefore not yet included in the G-series books, see the complete series of books below)
Under the tab QUOTES-1, at the top of the bar, you will find, in various orders, individual quotes from the "Spirit of Prophecy", these are especially important for Bible studies and Prophet Schools, but also for Worship Services.
Under the GENERAL tab, you will find all kinds of Bible studies, documents, etc...