- Arru, G. M., M. Covassi, and E. d. Bellis. 1966. Los principales insectos perjudiciales a los montes en Italia [The most important insect pests of the Italian forests). Servicio de Plagas Forestales, Boletin 931-41.
- Arru, G. M. 1967. Resistance to insects in poplars grown in Italy. XlVth Congress of the International Union of Forest Research Organizations, Proceedings, Munich, Part III. Section 22:861-866.