Anonym - Why is the distinction between primary and secondary sources a basis for scientific work and how do you assess a quote from Spiegelonline as a scientific source in this context?

Brand : Grin Verlag, Binding : Taschenbuch, Edition : 1., Label : GRIN Verlag, Publisher : GRIN Verlag, medium : Taschenbuch, numberOfPages : 20, publicationDate : 2018-08-28, releaseDate : 2018-08-28, authors : Anonym, ISBN : 3668787832 ...