(2008). Scientists confirms happiness is contagious. Philippine Daily Inquirer.
Dyfyniad Arddull Chicago"Scientists Confirms Happiness Is Contagious." Philippine Daily Inquirer 2008.
Dyfyniad MLA"Scientists Confirms Happiness Is Contagious." Philippine Daily Inquirer, 2008.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.