Gaya APA
Universitas Sumatera Utara, Lembaga Kependudukan. (1976).
Monograph of the population characteristic in North Sumatera .
Medan:
USU.
Gaya Chicago
Universitas Sumatera Utara, Lembaga Kependudukan.
Monograph of the population characteristic in North Sumatera.
Medan:
USU,
1976.
.
Gaya MLA
Universitas Sumatera Utara, Lembaga Kependudukan.
Monograph of the population characteristic in North Sumatera.
Medan:
USU,
1976.
.
Gaya Turabian
Universitas Sumatera Utara, Lembaga Kependudukan.
Monograph of the population characteristic in North Sumatera.
Medan:
USU,
1976.
.