Gaya APA

Sheperd, P. (2018). The Positive Approach : maanfaat berpikir & bersikap positif (cet.2). : Bright Publisher.

Gaya MLA

Sheperd, Peter. "The Positive Approach : maanfaat berpikir & bersikap positif". cet.2 : Bright Publisher, 2018. Text.