Não informado. (2020). Petroleum Age and Service Station Merchandising. Petroleum Age Publishing Company.
Chicago-referens (17:e uppl.)Não informado. Petroleum Age and Service Station Merchandising. Chicago, Ill: Petroleum Age Publishing Company, 2020.
MLA-referens (8:e uppl.)Não informado. Petroleum Age and Service Station Merchandising. Petroleum Age Publishing Company, 2020.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.