Gaya APA
Dowling, J, M., Yap, C. (2013).
"Happiness and Poverty in Developing Countries" .
Palgrave Macmillan UK:
Palgrave Macmillan.
Gaya MLA
Dowling, John, Malcolm., Yap, Chin-Fang.
""Happiness and Poverty in Developing Countries"".
Palgrave Macmillan UK:
Palgrave Macmillan,
2013.
E-Book.