Gaya APA
KEANE, J, G. (1986).
STATISTICAL Abstract of the united states 1987 : (107th.ed.).
Washington DC:
Bureau of the Census.
Gaya MLA
KEANE, John, G.
"STATISTICAL Abstract of the united states 1987 :".
107th.ed.
Washington DC:
Bureau of the Census,
1986.
Buku.