Gaya APA
SEMBIRING, M.
(2015).
OMSET BERLIPAT
.
SUMATERA UTARA:
CEMERLANG PIUBLISHING.
Gaya MLA
SEMBIRING, MESKARDO.
"OMSET BERLIPAT".
SUMATERA UTARA:
CEMERLANG PIUBLISHING,
2015.
Refrensi.