Barack Obama reelection, Guiné-Bissau, sheet of 4 stamps. The President Obama International Stamp Collection. No date given.
Reeleição de Barack Obama. No Date. Rodney Lawrence Hurst, Sr. Papers. University of North Florida. Thomas G. Carpenter Library. Special Collections and Archives. UNF Digital Commons. https://digitalcommons.unf.edu/hurst_stamps/140/
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