Dyfyniad APA

(1992). 1987 economic censuses. CD-ROM volume 2, Zip code statistics. Release 2B.

Dyfyniad Arddull Chicago

1987 Economic Censuses. CD-ROM Volume 2, Zip Code Statistics. Release 2B. 1992.

Dyfyniad MLA

1987 Economic Censuses. CD-ROM Volume 2, Zip Code Statistics. Release 2B. 1992.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.