Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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