(2015). 365 ideas of happiness (Cetakan Kedua.). Yogyakarta: B First.
Chicago Style Citation365 Ideas of Happiness. Cetakan Kedua. Yogyakarta: B First, 2015.
MLA Citation365 Ideas of Happiness. Cetakan Kedua. Yogyakarta: B First, 2015.
Warning: These citations may not always be 100% accurate.