APA-ийн эшлэл(7 дахь хэвлэлт)

Wren-Lewis, S. (2019). The happiness problem: Expecting better in an uncertain world. Policy Press.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Wren-Lewis, Sam. The Happiness Problem: Expecting Better in an Uncertain World. Bristol, UK ; Chicago, IL: Policy Press, 2019.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Wren-Lewis, Sam. The Happiness Problem: Expecting Better in an Uncertain World. Policy Press, 2019.