Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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