United States. Bureau of Entomology and Plant Quarantine. (1938). Counting℗Ư-cage heater for winter studies of insect populations in field. [s.n.].
Chicago Style (17th ed.) CitationUnited States. Bureau of Entomology and Plant Quarantine. Counting℗Ư-cage Heater for Winter Studies of Insect Populations in Field. [Washington]: [s.n.], 1938.
MLA (9th ed.) CitationUnited States. Bureau of Entomology and Plant Quarantine. Counting℗Ư-cage Heater for Winter Studies of Insect Populations in Field. [s.n.], 1938.
Warning: These citations may not always be 100% accurate.