BioStor
 | The spider genera Achaearanea, Theridion and Sphyrotinus from Mexico, Central America and the West Indies (Araneae, Theridiidae) H W Levi (1959) Bulletin of The Museum of Comparative Zoology 121: 55-163 |
 | The spider genera Achaearanea, Theridion and Sphyrotinus from Mexico, Central America and the West Indies (Araneae, Theridiidae) H W Levi (1959) Bull. Mus. comp. Zool. Harv. 121: 57-163 |
 | American spiders of the genus Theridion (Araneae, Theridiidae) H W Levi (1963) Bull. Mus. comp. Zool. Harv. 129: 481-589 |