APA (7th ed.) Citation

Nursi, S., & Nursi, S. (2002). Existence and divine unity: The twentieth letter, the twenty-third word. Light.

Chicago Style (17th ed.) Citation

Nursi, Said, and Said Nursi. Existence and Divine Unity: The Twentieth Letter, the Twenty-third Word. Rutherford, NJ: Light, 2002.

MLA (9th ed.) Citation

Nursi, Said, and Said Nursi. Existence and Divine Unity: The Twentieth Letter, the Twenty-third Word. Light, 2002.