Gaya APA
O'Driscoll, N., Barrett, F, S.
(1995).
Business Challenges Study Book
.
Essex Engand,:
Pearson Education.
Gaya MLA
O'Driscoll, Nina., Barrett, Fiona, Scott.
"Business Challenges Study Book".
Essex Engand,:
Pearson Education,
1995.
UMUM.