（英文譯文："“If desire for goods increases while its availability decreases, its price rises. On the other hand, if availability of the good increases and the desire for it decreases, the price comes down.”）Hosseini, Hamid S. Contributions of Medieval Muslim Scholars to the History of Economics and their Impact: A Refutation of the Schumpeterian Great Gap. Biddle, Jeff E.; Davis, Jon B.; Samuels, Warren J. (编). A Companion to the History of Economic Thought. Malden, MA: Blackwell. 2003: 28–45 [28 & 38]. ISBN 0631225730. doi:10.1002/9780470999059.ch3.
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Fleeming Jenkin, 1870. "The Graphical Representation of the Laws of Supply and Demand, and their Application to Labour," in Alexander Grant, ed., Recess Studies, Edinburgh. ch. VI, pp. 151-85. Edinburgh. Scroll to chapter link. （页面存档备份，存于互联网档案馆）
（英文譯文："“If desire for goods increases while its availability decreases, its price rises. On the other hand, if availability of the good increases and the desire for it decreases, the price comes down.”）Hosseini, Hamid S. Contributions of Medieval Muslim Scholars to the History of Economics and their Impact: A Refutation of the Schumpeterian Great Gap. Biddle, Jeff E.; Davis, Jon B.; Samuels, Warren J. (编). A Companion to the History of Economic Thought. Malden, MA: Blackwell. 2003: 28–45 [28 & 38]. ISBN 0631225730. doi:10.1002/9780470999059.ch3.
Thomas M. Humphrey, 1992. "Marshallian Cross Diagrams and Their Uses before Alfred Marshall," Economic Review, Mar/Apr, Federal Reserve Bank of Richmond, pp. 3-23. （页面存档备份，存于互联网档案馆）
Thomas M. Humphrey, 1992. "Marshallian Cross Diagrams and Their Uses before Alfred Marshall," Economic Review, Mar/Apr, Federal Reserve Bank of Richmond, pp. 3-23. （页面存档备份，存于互联网档案馆）
Fleeming Jenkin, 1870. "The Graphical Representation of the Laws of Supply and Demand, and their Application to Labour," in Alexander Grant, ed., Recess Studies, Edinburgh. ch. VI, pp. 151-85. Edinburgh. Scroll to chapter link. （页面存档备份，存于互联网档案馆）
