APA

Levi H. W., . (1959). The spider genera Achaearanea, Theridion and Sphyrotinus from Mexico, Central America and the West Indies (Araneae, Theridiidae). Cambridge, Mass: Museum of Comparative Zoology.

Chicago

Levi Herbert Walter, . 1959. The spider genera Achaearanea, Theridion and Sphyrotinus from Mexico, Central America and the West Indies (Araneae, Theridiidae). Cambridge, Mass: Museum of Comparative Zoology.

Harvard

Levi H. W., . (1959). The spider genera Achaearanea, Theridion and Sphyrotinus from Mexico, Central America and the West Indies (Araneae, Theridiidae). Cambridge, Mass: Museum of Comparative Zoology.

MLA

Levi Herbert Walter, . The spider genera Achaearanea, Theridion and Sphyrotinus from Mexico, Central America and the West Indies (Araneae, Theridiidae). Cambridge, Mass: Museum of Comparative Zoology. 1959.