地球的地殼元素豐度列表Abundance in Earth's Crust . WebElements .com. [2007-04-14]. (原始内容存档于2007-03-09). List of Periodic Table Elements Sorted by Abundance in Earth's crust
四氯化钛的有机反应 Periodic Table of Elements . Environmental Chemistry.com. [2007-04-14]. [失效連結] List of Periodic Table Elements Sorted by Abundance in Earth's crust . Israel Science
化學元素豐度 List of elements in order of abundance in the Earth's crust (页面存档备份,存于互联网档案馆) (only correct for the twenty most common elements ) Cosmic abundance of the
钕Periodic Table of Elements . Environmental Chemistry.com. [2007-04-14]. Abundance of elements in the earth’s crust and in the sea, CRC Handbook of Chemistry
碱土金属Chemistry and Physics 84th. Boca Raton, FL: CRC Press. 2003. Abundance in Earth's Crust . WebElements .com. [14 April 2007]. (原始内容存档于9 March 2007). 《无机化学》.高等教育出版社