Frost, Darrel R. (2024). "Hylodes asper (Müller, 1924)". Amphibian Species of the World: an Online Reference. Version 6.2. American Museum of Natural History. doi:10.5531/db.vz.0001. Retrieved 29 September 2024.
amphibiaweb.org
Kellie Whittaker (2014). "Hylodes asper". AmphibiaWeb: Information on amphibian biology and conservation [web application]. Berkeley, California: AmphibiaWeb. Retrieved 29 September 2024.
Frost, Darrel R. (2024). "Hylodes asper (Müller, 1924)". Amphibian Species of the World: an Online Reference. Version 6.2. American Museum of Natural History. doi:10.5531/db.vz.0001. Retrieved 29 September 2024.