LibrarySearch, and most online databases now have 'instant citation creators' somewhere on the page where you find your source.
In LibrarySearch, for example, just click the "quotation" icon on any item in the result list to create a citation:
For another example, JSTOR includes a small tool box with various ways to capture citations:
PN1990-1990.92 Broadcasting (general)
PN1991-1991.92 Radio broadcasts
PN1992-1992.92 Television broadcasts
PN1992.93-1992.95 Nonbroadcast video recordings
PN1993-1999 Motion pictures
PN1997-1997.85 Screenplays, scenarios, etc.