16. you are researching the treatment of add with diet modifications. you find the results of a clinical trial where the subjects were not given medication, but were given a strict diet. this source is primary source or secondary source 17. you are doing a report on a modern author and find newspaper articles reviewing one of his latest works. this source is primary source or secondary source 18. you are looking into suburban population change over the past ten years and you find the u. s. cebsus statistics. this source is primary source or secondary source 19. you are doing a report on canadian history and find the constitution of canada. this source is primary source or secondary source 20. when you are conducting research, you should use any source you can find on your topic. true or false