APA (7a ed.)

Fernández, J. e., Martínez, L., Perino, E., Olsina, R., & Marchevsky, E. (1999). Sensitive spectrophotometric determination of holmium (III) in geological and lasers samples with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol. Anales de la Asociación Química Argentina, 87(1).