APA

Library of Congress, Ehrenberg R. E., . (1996). Library of Congress geography and maps: an illustrated guide. Washington: Library of Congress.

Chicago

Library of Congress, Ehrenberg Ralph E, . 1996. Library of Congress geography and maps: an illustrated guide. Washington: Library of Congress.

Harvard

Library of Congress, Ehrenberg R. E., . (1996). Library of Congress geography and maps: an illustrated guide. Washington: Library of Congress.

MLA

Library of Congress, Ehrenberg Ralph E, . Library of Congress geography and maps: an illustrated guide. Washington: Library of Congress. 1996.