Hasson, G. (2022). 21 Day Mindfulness Challenge. John Murray Learning.
Lua i Stíl Chicago (17ú heag.)Hasson, Gill. 21 Day Mindfulness Challenge. UK: John Murray Learning, 2022.
Lua MLA (9ú heag.)Hasson, Gill. 21 Day Mindfulness Challenge. John Murray Learning, 2022.
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