Gaya APA
Situmorang, S, H.
(2007).
Studi Kelayakan Bisnis Buku 1
(
First Edition)
.
Medan:
USU Press.
Gaya MLA
Situmorang, Syafrizal, Helmi.
"Studi Kelayakan Bisnis Buku 1".
First Edition
Medan:
USU Press,
2007.
eBook.