Danbooru-based image board with a specialization in high-quality images.
aka_ringo nagae_iku touhou

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does second-hand source qualify as source?
i duuno your definition of "second-hand source". At least 骨折饮料 (the author of that blog) scanned this, so I think it's a type of source, like pireze.
Yup, I was meaning to ask whether scanners should appear in source field or only doujinshi titles or magazine names should appear there.
I usually put on the source as where ever I found the item. Not all the time you can find the actual place it got scanned. Sources can also be used for the title of the book since sometimes only 1-2 images from the book are scanned. I see radio do that quite a bit.