When building a new instrument to measure one or more specific dimensions, you might well first decide whether an existing measure with adequate technical quality is already available; this will save you considerable time, effort and cost in your own work.
If you've decided there is no such measure available (which implies you've already done a thorough literature review), then feel free to list as many relevant resources for potential stimuli / items / questions as you encountered during the literature review. However, do note that directly lifting items or questions from copyright material without authorization to do so by publisher and/or author leaves you vulnerable to copyright infringement claims.
To get to your query more directly, I'd encourage looking at multiple sources, so as to be more certain that you (and your team) had identified all of the salient elements associated with the target dimensions of interest. It wouldn't hurt to have your list reviewed by domain experts to assure that: (a) the elements you've selected are, in fact, pertinent; and (b) you haven't overlooked important elements.