APA Style
Wiking, Meik. (2019).
The key to happiness .
UK:
Penguin.
Chicago Style
Wiking, Meik.
The key to happiness.
UK:
Penguin,
2019.
Text.
MLA Style
Wiking, Meik.
The key to happiness.
UK:
Penguin,
2019.
Text.
Turabian Style
Wiking, Meik.
The key to happiness.
UK:
Penguin,
2019.
Print.