Gaya APA
Statistik, B, P. (1985).
Rata-rata upah pekerja perkebunan 1981-1983 = Average wage of estate workers 1981-1983 .
Jakarta:
BPS.
Gaya MLA
Statistik, BIRO, Pusat.
"Rata-rata upah pekerja perkebunan 1981-1983 = Average wage of estate workers 1981-1983".
Jakarta:
BPS,
1985.
Buku.