As the question says. Can you use as secondary Data White Papers and Corporate Publications? Do they have the same strength as other secondary data used in research?
Corporate white papers and other publications are usually public relations documents, intended to describe a problem and show how the company's products/services solve the problem.
You CAN quote them, if relevant, but be cautious because they may be one-sided.
Below you can find a link to as study produced for the purpose of research techniques for humanitarian needs assessment, however in its introduction you have the definition of the specific type of secondary data sources and it might provide you with a good literate support for choosing, for instance, corporate white papers, which are, nonetheless, as Michael righty noticed, pretty biased.