Peterson, C. (2006). A Primer in positive psychology. Oxford University Press.
Dyfyniad Arddull ChicagoPeterson, Christopher. A Primer in Positive Psychology. Oxford: Oxford University Press, 2006.
Dyfyniad MLAPeterson, Christopher. A Primer in Positive Psychology. Oxford University Press, 2006.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.