What are the entries for a manual reference? For example the following entry:
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@manual{x13seats,title = {X-13ARIMA-SEATS Reference Manual},author = {U.S. Census Bureau},organization = {U.S. Census Bureau},address = {Washington, DC},month = 7,year = 2017,url = {https://www.census.gov/srd/www/winx13/WinX13Doc.html}}