APA (7th ed.) Citation

Upton, C. (1988). Doorkeeper of the heart: Version of Rabi'a. Threshold Books.

Chicago Style (17th ed.) Citation

Upton, Charles. Doorkeeper of the Heart: Version of Rabi'a. Threshold Books, 1988.

MLA (8th ed.) Citation

Upton, Charles. Doorkeeper of the Heart: Version of Rabi'a. Threshold Books, 1988.

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