Παραπομπή σε μορφή APA (7η εκδ.)

Villegas, J. L., Castro, E., & Gutiérrez, J. (2012). Representations in problem solving: A case study with optimization problems. Universidad de Almería.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Villegas, José L., Enrique Castro, και José Gutiérrez. Representations in Problem Solving: A Case Study with Optimization Problems. Universidad de Almería, 2012.

Παραπομπή σε μορφή MLA (8th εκδ.)

Villegas, José L., et al. Representations in Problem Solving: A Case Study with Optimization Problems. Universidad de Almería, 2012.