"Hyla halowellii (Linnaeus, 1758)". Amphibian Species of the World 6.0, an Online Reference. American Museum of Natural History. Retrieved November 24, 2020.
Ugur Kaya; Aram Agasyan; Aziz Avisi; Boris Tuniyev; Jelka Crnobrnja Isailovic; Petros Lymberakis; Claes Andrén; Dan Cogalniceanu; John Wilkinson; Natalia Ananjeva; Nazan Üzüm; Nikolai Orlov; Richard Podloucky; Sako Tuniyev; U?ur Kaya (2009). "Hyla arborea". 2020. The IUCN Red List of Threatened Species: e.T10351A3197528. doi:10.2305/IUCN.UK.2009.RLTS.T10351A3197528.en. Retrieved November 24, 2020. {{cite journal}}: Cite journal requires |journal= (help)
iucnredlist.org
Ugur Kaya; Aram Agasyan; Aziz Avisi; Boris Tuniyev; Jelka Crnobrnja Isailovic; Petros Lymberakis; Claes Andrén; Dan Cogalniceanu; John Wilkinson; Natalia Ananjeva; Nazan Üzüm; Nikolai Orlov; Richard Podloucky; Sako Tuniyev; U?ur Kaya (2009). "Hyla arborea". 2020. The IUCN Red List of Threatened Species: e.T10351A3197528. doi:10.2305/IUCN.UK.2009.RLTS.T10351A3197528.en. Retrieved November 24, 2020. {{cite journal}}: Cite journal requires |journal= (help)