Gaya APA
Tomasulo, D. (2023).
The Positivity Effect: Simple CBT Skills to Transform Anxiety & Negativity into Optimism & Hope .
English:
New Harbinger.
Gaya MLA
Tomasulo, Dan.
"The Positivity Effect: Simple CBT Skills to Transform Anxiety & Negativity into Optimism & Hope".
English:
New Harbinger,
2023.
.