Pengaruh kedekatan hubungan antara pemberi dan penerima tindakan baik terhadap kebahagiaan = The effect of closeness between giver and receiver act of kindness on happiness

Pengaruh aktivitas menghitung berkat terhadap kebahagiaan dan kepuasan pernikahan = The effect of counting one's blessings on happiness and marital satisfaction

Pengaruh menghitung berkah dari kebaikan orang lain terhadap kebahagiaan = The effect of counting blessing from others kindness towards happiness

Lebih baik sekarang daripada nanti: pengaruh waktu pemberian umpan balik dari penerima surat terima kasih terhadap kebahagiaan pengirim = Better now than later: the effect of delayed feedback from receiver of gratitude letter towards sender's happiness

The Conquest of happiness / Bertrand Russell