Dayal, K. (2010). How to be happy: Despite failures and frustrations. Read worthy.
Chicago Style aipamenaDayal, Keshav. How to Be Happy: Despite Failures and Frustrations. New Delhi: Read worthy, 2010.
MLA aipamenaDayal, Keshav. How to Be Happy: Despite Failures and Frustrations. Read worthy, 2010.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.