APA Style

Tomasulo, D. (2023). The positivity effect: simple CBT skills to transform anxiety and negativity into optimism and hope (Ed. 1). London: New Harbinger Publications.

MLA Style

Tomasulo, Dan. "The positivity effect: simple CBT skills to transform anxiety and negativity into optimism and hope". Ed. 1 London: New Harbinger Publications, 2023. Text.