Gaya APA

-, ., Smith, G. (2021). The Book Of Over Thinking: Cara Menghentikan Siklus Kekhawatiran (-). Yogyakarta: Shira Media.

Gaya MLA

-, ., Smith, Gwendoline. "The Book Of Over Thinking: Cara Menghentikan Siklus Kekhawatiran". - Yogyakarta: Shira Media, 2021. Text.