(1929). Magnetic Declination in Delaware, Maryland, Virginia, West Virginia, Kentucky and Tennessee. United States Government Printing Office.
Chicago-Zitierstil (17. Ausg.)Magnetic Declination in Delaware, Maryland, Virginia, West Virginia, Kentucky and Tennessee. Washington: United States Government Printing Office, 1929.
MLA-Zitierstil (9. Ausg.)Magnetic Declination in Delaware, Maryland, Virginia, West Virginia, Kentucky and Tennessee. United States Government Printing Office, 1929.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.