Gaya APA
Heen, S. et al (2010).
Difficult Conversations : How to Discuss What Matters Most .
Wyman Street, Usa:
Penguin Books.
Gaya MLA
Heen, Sheila. et al.
"Difficult Conversations : How to Discuss What Matters Most".
Wyman Street, Usa:
Penguin Books,
2010.
FIC.