APA (7th ed.) Citation

Louis Harris and Associates. (1971). The 1971 National Reading Difficulty Index: A Study of Functional Reading Ability in the U.S. for the National Reading Center. Distributed by ERIC Clearinghouse.

Chicago Style (17th ed.) Citation

Louis Harris and Associates. The 1971 National Reading Difficulty Index: A Study of Functional Reading Ability in the U.S. for the National Reading Center. [Place of publication not identified]: Distributed by ERIC Clearinghouse, 1971.

MLA (9th ed.) Citation

Louis Harris and Associates. The 1971 National Reading Difficulty Index: A Study of Functional Reading Ability in the U.S. for the National Reading Center. Distributed by ERIC Clearinghouse, 1971.