Gaya APA

Smith, G. (2021). The Book Of Overthinking: Cara Menghentikan Siklus Kekhawatiran (Cet.2). Yogyakarta: Shira Media.

Gaya MLA

Smith, Gwendoline. "The Book Of Overthinking: Cara Menghentikan Siklus Kekhawatiran". Cet.2 Yogyakarta: Shira Media, 2021. Text.