APA

E.U.A. Social Security Administration, Bell F. C., . (1997). Social security area population projections: 1997. Baltimore: SSA. Office of the Chief Actuary.

Chicago

E.U.A. Social Security Administration, Bell Felicitie C, . 1997. Social security area population projections: 1997. Baltimore: SSA. Office of the Chief Actuary.

Harvard

E.U.A. Social Security Administration, Bell F. C., . (1997). Social security area population projections: 1997. Baltimore: SSA. Office of the Chief Actuary.

MLA

E.U.A. Social Security Administration, Bell Felicitie C, . Social security area population projections: 1997. Baltimore: SSA. Office of the Chief Actuary. 1997.