Cita APA (7a ed.)

Prieto, G., Velasco, A. D., Arias-Barahona, R., Anido, M., Núñez, A. M., & Có, P. (2007). DIFFICULTY ANALYSIS IN A SPATIAL VISUALIZATION ITEM BANK.

Cita Chicago Style (17a ed.)

Prieto, Gerardo, Angela D. Velasco, Rosario Arias-Barahona, Marcedes Anido, Ana María Núñez, y Patricia Có. DIFFICULTY ANALYSIS IN A SPATIAL VISUALIZATION ITEM BANK. 2007.

Cita MLA (9a ed.)

Prieto, Gerardo, et al. DIFFICULTY ANALYSIS IN A SPATIAL VISUALIZATION ITEM BANK. 2007.