The review of last year's sales for the months of June and August by a heating and air conditioning firm would be considered a secondary source. This is because it analyzes and interprets data (sales figures) from a previous time period (last year), rather than being a direct account or original data collection related to the current year’s summer sales.
Primary or secondary source? When for eating this years summer sales a heating and air conditioning firm reviews their last years sales for the months of June and august
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