[DamnInteresting]

Most of the time it's also necessary to put quotation marks or similar formatting (e.g., box, pullquote, or indentation) on the cited text to make it clear a) that it is a citation; and b) where the citation begins and ends.

If one does that, assuming citations are not the bulk of the work, one should be in the clear.

[henearkr]

But this doesn't apply in Klein's case, as he rephrased, and this had some purpose as it increased the integration and logical coherence of the whole.

If it is rephrased, you cannot just put quotation marks.

But you still have to indicate the source of the rephrasing (especially when it is lightly rephrased) e.g. by a footnote.