(2008). Scientists confirms happiness is contagious. Philippine Daily Inquirer.
Chicago (17e ed.) Bronvermelding"Scientists Confirms Happiness Is Contagious." Philippine Daily Inquirer 2008.
MLA (9e ed.) Bronvermelding"Scientists Confirms Happiness Is Contagious." Philippine Daily Inquirer, 2008.
Let op: Deze citaties zijn niet altijd 100% accuraat.