Gaya APA

Smith, G. et al (2021). The book of overthinking: cara menghentikan siklus kekhawatiran (Cet. 5). Yogyakarta: Shira Media.

Gaya MLA

Smith, Gwendoline. et al. "The book of overthinking: cara menghentikan siklus kekhawatiran". Cet. 5 Yogyakarta: Shira Media, 2021. Text.