Gaya APA
Shepherd, P. et al (2018).
The Positive Approach : Manfaat Berpikir & Bersikap Positif (cet1).
Yogyakarta:
Bright Publisher.
Gaya MLA
Shepherd, Peter. et al.
"The Positive Approach : Manfaat Berpikir & Bersikap Positif".
cet1
Yogyakarta:
Bright Publisher,
2018.
Text.