As for the PDF version, I couldn't find a legitimate online source that provides the book for free or by subscription. However, you may be able to find online stores or bookshops that sell the book in digital format.

"Kitab Sulam Taufiq" is a well-known book written by K.H. Ahmad Sahal, an Indonesian Muslim scholar and educator. The book is considered a seminal work in the context of Indonesian Islamic education, particularly in Pesantren (Islamic boarding schools).

The book, "Sulam Taufiq," is a comprehensive guide to Islamic education and spiritual growth. The title "Sulam" translates to "ladder" or " staircase," and "Taufiq" means "guidance" or " enlightenment." The book provides guidance on how to climb the stairs of spiritual growth, attain spiritual enlightenment, and become a better Muslim.