O shops portray Christian Christmas festivity or perpetuate a commercial tradition?

I am an Interior Design student. (BA) final year
I would like you to research:
Journals regards Christmas and Shops such as Harrods, Selfridges, Debenhams and Window Display journals.
Books regarding Christmas fesitivity and how shops portray it.
Commerciality through festive seasons
*Bratcher Dennis, The Christmas Season
*Varga, Melody, Blsck Friday, About:Retail Industry
*New York Times This Seasons War Cry: commercialize Christmas