Information sources that have been written by academics, experts or creative practitioners in a particular field or discipline, and published in books, conference publications and academic journal articles, can usually be considered scholarly.
They may report on original research, review books and exhibitions, address current issues facing the contemporary design landscape, or examine events through the lenses of history and theory. They are your best source of information about about practice and industry, as well as issues pertaining to advertising, branding, packaging and consumer behaviour.