Gaya APA
SAMUELSON, S. et al (2016).
Business law and the legal enviroment (7th ed.).
United States of America:
CENGAGE Learning.
Gaya MLA
SAMUELSON, S.. et al.
"Business law and the legal enviroment".
7th ed.
United States of America:
CENGAGE Learning,
2016.
Buku.