APA (7th ed.) Citation

B.R. von Schlegell. (2004). Principles of sufism: Al-Qushaysi. Islamic Book Trust.

Chicago Style (17th ed.) Citation

B.R. von Schlegell. Principles of Sufism: Al-Qushaysi. Petaling Jaya: Islamic Book Trust, 2004.

MLA (8th ed.) Citation

B.R. von Schlegell. Principles of Sufism: Al-Qushaysi. Islamic Book Trust, 2004.

Warning: These citations may not always be 100% accurate.