»The History of the Emblems«. 14. marec 2006. Arhivirano iz prvotnega spletišča dne 3. avgusta 2012. Pridobljeno 29. maja 2009. History of the emblems of the International Red Cross: An account of this organisation's need to adopt an emblem to represent itself, and the factors which led to it eventually adopting a second (the red crescent) and third (the red crystal).
»The History of the Emblems«. 14. marec 2006. Arhivirano iz prvotnega spletišča dne 3. avgusta 2012. Pridobljeno 29. maja 2009. History of the emblems of the International Red Cross: An account of this organisation's need to adopt an emblem to represent itself, and the factors which led to it eventually adopting a second (the red crescent) and third (the red crystal).
macmillandictionary.com
»Macmillan Dictionary«. Macmillan Publishers. 2009. Pridobljeno 29. maja 2009. macmillandictionary.com entry for "skull and crossbones"
Piperno, Roberto. Rosamie Moore (ur.). »Obelisks of Rome«. Pridobljeno 29. maja 2009.[mrtva povezava][mrtva povezava] Historical information, a map, photographs, and descriptions of Egyptian obelisks in Rome.
