8 Steps to Happiness by Shaykh Abu Abdur-Rahman Nasir al-Sadi
The Inner Secrets of Worship by Imam Ibn Qudamah al-Maqdisi [d. 689H]
Discipline: The Path to Spiritual Growth By Imam Ibn Qudamah al-Maqdisi (d. 689H)
The Refinement of Character By Ibn Qudamah al-Maqdisi [d. 689H]
Captured Thoughts by Imam Ibn Jawzi (d. 597 AH)