APA (7th ed.) Citation

White, M. D., & Iivonen, M. (2002). Assessing Level of Difficulty in Web Search Questions.

Chicago Style (17th ed.) Citation

White, Marilyn Domas, and Mirja Iivonen. Assessing Level of Difficulty in Web Search Questions. 2002.

MLA (9th ed.) Citation

White, Marilyn Domas, and Mirja Iivonen. Assessing Level of Difficulty in Web Search Questions. 2002.

Warning: These citations may not always be 100% accurate.