Penggayaan APA
COLLINS, Gary. (2012).
Successful selling in easy steps .
[s.l.]:
[s.n.].
Chicago Style
COLLINS, Gary.
Successful selling in easy steps.
[s.l.]:
[s.n.],
2012.
Buku.
MLA Style
COLLINS, Gary.
Successful selling in easy steps.
[s.l.]:
[s.n.],
2012.
Buku.
Turabian Style
COLLINS, Gary.
Successful selling in easy steps.
[s.l.]:
[s.n.],
2012.
Buku.