The search for "Kitab Takatul" typically refers to the book The Structuring of a Party At-Takatul al-Hizbi ), a foundational text by Sheikh Taqiuddin al-Nabhani
If you cannot find a legal PDF, check academic databases like JSTOR, Google Scholar, or Noor Digital Library (for Arabic texts). Many universities have digitized out-of-print Islamic books for research purposes. kitab takatul pdf