APA (7th ed.) Citation

Kremer, A. (1977). The Orient under the caliphs. Porcupine Press.

Chicago Style (17th ed.) Citation

Kremer, Alfred. The Orient Under the Caliphs. Philadelphia: Porcupine Press, 1977.

MLA (8th ed.) Citation

Kremer, Alfred. The Orient Under the Caliphs. Porcupine Press, 1977.

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