Guide to the National Archives of the United States
MLA
Campbell, E. G., Frank Bernard Evans, and Shelby G Bale. Guide to the National Archives of the United States.
APA, 7th edition
Campbell, E. G., Evans, F. Bernard, & Bale, S. G. Guide to the National Archives of the United States.
Chicago, 17th edition
Campbell, E. G., Frank Bernard Evans, and Shelby G. Bale. Guide to the National Archives of the United States.