(原始内容存档于2014-10-06). Dept. of English and Journalism. Indiana names, v.1-3. IndianaStateUniversity. 1970–72: 15 [2020-07-21]. (原始内容存档于2020-07-29). American
ISBN 0-8117-3100-6. State Tree of INDIANA. Indiana Woodland Steward. Purdue University. [2007-11-23]. (原始内容存档于2007-10-08). 美国主题 Indiana Code Title 1, Article