1967

• Viggiani, G. 1967: Richerche sugli Hymenoptera Chalcidoidea. X. Nuovi reperti di Calcidoidei italiani (Encyrtidae, Eulophidae, Aphelinidae, Mymaridae). Bollettino del Laboratario di Entomologia Agraria 'Filippo Silvestri' di Portici 25: 119-149. full article (pdf). Reference page. 

1989

• Viggiani, G. 1989: Two new species of Encarsia Foerster (Hymenoptera: Aphelinidae) from Africa. Redia 72: 513-517. Reference page. 

• Viggiani, G. 1989a: Three new species of Encarsia Foerster (Hym.: Chalcidoidea). 1. Aphelinidae, Mymaridae, Signiphoridae and Trichogrammatidae of the Cape Verde Islands. Bollettino del Laboratario di Entomologia Agraria 'Filippo Silvestri' di Portici 46: 175-184. full article (pdf). Reference page. 

• Viggiani, G. 1989b: Notes on some Nearctic and Neotropical Encarsia Foerster (Hymenoptera: Aphelinidae). Bollettino del Laboratario di Entomologia Agraria 'Filippo Silvestri' di Portici 46: 207-213. full article (pdf). Reference page. 

1993

• Viggiani, G. 1993: New species of Encarsia Foerster (Hym: Aphelinidae), parasitoids of whiteflies, from Hawaii and Yemen. Redia 76: 121-127. Reference page. 

2015

• Bella, S., Cupani, S., D'urso, V., Laudonia, S., Sinno, M. & Viggiani, G. 2015. Description of a new species of Oligosita Walker (Chalcidoidea: Trichogrammatidae), egg parasitoid of Balclutha brevis Lindberg (Homoptera: Cicadellidae) living on Pennisetum setaceum, from Italy. Zootaxa 4039(4): 583–590. DOI: 10.11646/zootaxa.4039.4.8 . Preview (PDF) Full article (PDF) Reference page. 

2017

• Bernardo, U., Gualtieri, L., Nugnes, F., Verdolini, E., Riolo, P. & Viggiani, G. 2017. A new species of Soikiella Nowicki (Hymenoptera: Trichogrammatidae) from Italy. Zootaxa 4242(1): 185–192. DOI: 10.11646/zootaxa.4242.1.10 . Reference page. 

• Laudonia, S., Viggiani, G. & Biondi, S. 2017. A new species of Poropoea Foerster from Africa (Hymenoptera, Chalcidoidea, Trichogrammatidae). ZooKeys 658: 81-87. DOI: 10.3897/zookeys.658.11501 . Reference page.