Ahmad bin Abdirrahman bin Qudamah al-Maqdisi, Mukhtashor Minhajul Qasidin, Jilid 4 hlm. 139 -- 147. Lihat juga Yatimah Sarmani, Mohd. Tajuddin Ninggal, Teori Kaunseling Al-Ghazali, (Kuala Lumpur: PTS Islamika, 2008), hlm. 98
M. Abdul Mujieb, Syafih, Ahmad Ismail M, Ensiklopedia Tasawuf Imam Al-Ghazali, (Jakarta: Penerbit Hikmah, 2009), hlm. 381-382
Justin Parrot, How to be a Mindful Muslim: An Exercise in Islamic Meditation, Yaqeen Institute. link: https://yaqeeninstitute.org/en/justin-parrott/how-to-be-a-mindful[1]muslim-an-exercise-in-islamic-meditation/ (diakses 17-01-2022, jam 11.41 WIB)
Infodatin Kesehatan Jiwa, Pusdatin Kemkes. Link: https://www.google.com/search?client=firefoxd&q=Badan+Pengembangan+Kesehatan+Mental+Kementerian+Kesehatan+Indonesia# (diakses 17-01-2022, jam 09.46 WIB)
