(1992). 1987 economic censuses. CD-ROM volume 2, Zip code statistics. Release 2B.
芝加哥风格引文1987 Economic Censuses. CD-ROM Volume 2, Zip Code Statistics. Release 2B. 1992.
MLA引文1987 Economic Censuses. CD-ROM Volume 2, Zip Code Statistics. Release 2B. 1992.
警告：这些引文格式不一定是100％准确.