APA Style
GURNSEY, John. (1989).
Information Consultancy .
:
.
Chicago Style
GURNSEY, John.
Information Consultancy.
:
,
1989.
Buku.
MLA Style
GURNSEY, John.
Information Consultancy.
:
,
1989.
Buku.
Turabian Style
GURNSEY, John.
Information Consultancy.
:
,
1989.
Buku.