Gary, R. (2008). The presidents were here: A state-by-state historical guide. McFarland & Co.
Chicago-Zitierstil (17. Ausg.)Gary, Ralph. The Presidents Were Here: A State-by-state Historical Guide. Jefferson, NC [u.a.]: McFarland & Co, 2008.
MLA-Zitierstil (9. Ausg.)Gary, Ralph. The Presidents Were Here: A State-by-state Historical Guide. McFarland & Co, 2008.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.