Forsyth, Ilene H.. "CHAPTER V. The Twelfth Century". Throne of Wisdom, Princeton: Princeton University Press, 1972, pp. 134-155. https://doi.org/10.1515/9780691196725-008
Forsyth, I. (1972). CHAPTER V. The Twelfth Century. In Throne of Wisdom (pp. 134-155). Princeton: Princeton University Press. https://doi.org/10.1515/9780691196725-008
Forsyth, Ilene H.. "CHAPTER V. The Twelfth Century" In Throne of Wisdom, 134-155. Princeton: Princeton University Press, 1972. https://doi.org/10.1515/9780691196725-008