APA (7th ed.) Citation

United States. Bureau of Entomology and Plant Quarantine. (1939). Contents and index of Entomological technic (ET) circulars Nos. ET-101 to ET-150. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Entomology and Plant Quarantine. Contents and Index of Entomological Technic (ET) Circulars Nos. ET-101 to ET-150. [Washington]: [s.n.], 1939.

MLA (9th ed.) Citation

United States. Bureau of Entomology and Plant Quarantine. Contents and Index of Entomological Technic (ET) Circulars Nos. ET-101 to ET-150. [s.n.], 1939.