Isaac, N. B. (1999). Help your country, serve your countrymen: A message to the graduates. Manila Bulletin.
Chicago-referens (17:e uppl.)Isaac, Norman B. "Help Your Country, Serve Your Countrymen: A Message to the Graduates." Manila Bulletin 1999.
MLA-referens (9:e uppl.)Isaac, Norman B. "Help Your Country, Serve Your Countrymen: A Message to the Graduates." Manila Bulletin, 1999.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.