Walker, M. (2013). Happy-people-pills for all. Wiley-Blackwell.
Cita Chicago (17th ed.)Walker, Mark. Happy-people-pills for All. Chichester, West Sussex, U.K.: Wiley-Blackwell, 2013.
Cita MLA (9th ed.)Walker, Mark. Happy-people-pills for All. Wiley-Blackwell, 2013.
Atenció: Aquestes cites poden no estar 100% correctes.