Many of these databases have a mixture of source types. Some examples:
Please use the limiters within databases to narrow down to the types of sources you can use.
"Introduction to EBSCOhost - Tutorial" by EBSCO Tutorials (4:08).
EBSCOhost provides a number of databases, and most work in the way the video shows. However, there may be different filters to narrow your results between the databases provided by EBSCOhost.
"Gale Academic OneFile Database Search" (4:13) by Sandburg Library (CC BY)
"Using Ethnic NewsWatch" (starts at 0:52 and ends at 2:04) by
"Searching the JSTOR Database" (6:08; video clip starts at 0:24) by Pace University Library
"Literature Resource Center" (starts at 1:01 and ends at 5:46) by