Whether you are republishing content, repurposing content or quoting great content written by someone else, you must always properly cite sources to give credit where it is due. Corey Eldron (Follow Her on Twitter) from the Inbound Marketing team at HubSpot, published a great article that provides advice for making attribution of content and images much easier.
Various sources, including QuickSprout.com, state that there are 10 major roadblocks to content creation. Familiar to all is writer's block. Additional roadblocks include: reader engagement, time management, budget, and management of the content marketing team.