Gaya APA
Statistik, I, B, P. (1991).
Statistik Indonesia 1991 : Statistical yearbook of Indonesia 1991 .
Jakarta:
BPS.
Gaya MLA
Statistik, Indonesia., Biro, Pusat.
"Statistik Indonesia 1991 : Statistical yearbook of Indonesia 1991".
Jakarta:
BPS,
1991.
Text.