statistiska centralbyran. (1989). statistical abstract of sweden 1990: Sveriges officiella statistik. statistics of sweden.
芝加哥风格引文statistiska centralbyran. Statistical Abstract of Sweden 1990: Sveriges Officiella Statistik. sweden: statistics of sweden, 1989.
MLA引文statistiska centralbyran. Statistical Abstract of Sweden 1990: Sveriges Officiella Statistik. statistics of sweden, 1989.
警告：这些引文格式不一定是100％准确.