Gaya APA

Barker, A. (2019). Improve your skills - how to build trust, be heard and communicate with confidence (Edisi 5). United State of America: Kogan Page.

Gaya MLA

Barker, ALan. "Improve your skills - how to build trust, be heard and communicate with confidence". Edisi 5 United State of America: Kogan Page, 2019. TEXT.