The WPA Historical Records Survey :
a guide to the unpublished inventories, indexes, and transcripts /
compiled by Loretta L. Hefner.
APA Citation
Hefner, L. L., Historical Records Survey (U.S.)., Society of American Archivists. (1980). The WPA Historical Records Survey: a guide to the unpublished inventories, indexes, and transcripts. Chicago: Society of American Archivists.
MLA Citation
Hefner, Loretta L, Historical Records Survey (U.S.), and Society of American Archivists. The WPA Historical Records Survey: a Guide to the Unpublished Inventories, Indexes, And Transcripts. Chicago: Society of American Archivists, 1980.
Warning: These citations may not always be complete (especially for serials).