Vashdev, Gobind, author
Happiness inside
Noura Books, 2012
 Buku Teks
Tan, Chade-Meng, author
Search inside yourself : the unexpected path to achieving success, happiness (and world peace)
Bentang, 2016
 Buku Teks
Grinde, Bjørn
The biology of happiness
Springer, 2012
 eBooks
Joo, Youngha, author
Happiness battle
PT Gramedia Pustaka Utama, 2022
 Buku Teks
Compton, Charles, author
Inside chemistry
McGarw-Hill, 1979
 Buku Teks
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