Não informado. (1992). Test. Spanish Society of Statistics and Operations Research.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Test. Madrid: Spanish Society of Statistics and Operations Research, 1992.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Test. Spanish Society of Statistics and Operations Research, 1992.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.