APA (7th ed.) Citation

Spencer, D. (2009). Card sorting: Designing usable categories. Rosenfeld Media.

Chicago Style (17th ed.) Citation

Spencer, Donna. Card Sorting: Designing Usable Categories. Brooklyn, New York: Rosenfeld Media, 2009.

MLA (9th ed.) Citation

Spencer, Donna. Card Sorting: Designing Usable Categories. Rosenfeld Media, 2009.