Gülen, F. Emerald hills of the heart: Key concepts in the practice of sufism (Rev. ed.). Tughra Books.
Chicago Style (17th ed.) CitationGülen, Fethullah. Emerald Hills of the Heart: Key Concepts in the Practice of Sufism. Rev. ed. Clifton: Tughra Books.
MLA (9th ed.) CitationGülen, Fethullah. Emerald Hills of the Heart: Key Concepts in the Practice of Sufism. Rev. ed. Tughra Books.
Warning: These citations may not always be 100% accurate.