APA-viite (7. p.)
Federal Writers' Project & ebrary, Inc. (2007). The WPA guide to 1930s Iowa. University of Iowa Press.
Chicago-viite (17. p.)
Federal Writers' Project ja Inc ebrary. The WPA Guide to 1930s Iowa. Iowa City: University of Iowa Press, 2007.
MLA-viite (9. p.)
Federal Writers' Project ja Inc ebrary. The WPA Guide to 1930s Iowa. University of Iowa Press, 2007.
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