(1999). Annual Report 1998: Iowa State University Extension. Leading Iowa into the 21st century.
Chicago-čujuhus (17. p.)Annual Report 1998: Iowa State University Extension. Leading Iowa into the 21st Century. 1999.
MLA-čujuhus (9. p.)Annual Report 1998: Iowa State University Extension. Leading Iowa into the 21st Century. 1999.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.