1054 - Unknown column '6308ref' in 'where clause'

SELECT ps.specification, ps.specifications_id, sd.specification_name FROM products_specifications ps JOIN specification_description sd ON ps.specifications_id = sd.specifications_id WHERE ps.products_id = 6308ref AND ( ps.specification = 'Edible Cake Images' OR ps.specification = 'Sugar Cake Decorations (Dec-ons)' OR ps.specification = 'Filled Favor Boxes' ) AND ps.specifications_id = 59