Citazione Stile APA (7a Edizione)

Gulen, F., & Unal, A. (2004). Key concepts in the practice of Sufism: Emerald hills of the heart. Light.

Citazione stile Chigago Style (17a edizione)

Gulen, Fethullah, e Ali Unal. Key Concepts in the Practice of Sufism: Emerald Hills of the Heart. Somerset, N.J: Light, 2004.

Citatione MLA (9a ed.)

Gulen, Fethullah, e Ali Unal. Key Concepts in the Practice of Sufism: Emerald Hills of the Heart. Light, 2004.