I have heard of way that you can use more than one person's dialogue in a paragraph. This is not the conventional thinking however I decided to search it on Google.com. But most of the answers have pointed me in the direction I am trying to avoid. They say that you can only place one speaker's dialogue in a paragraph. Now I am not trying to dismiss these as erroneous immediately, but trust the source that gave me the aforementioned information (and the sources also say that it is important to use said-bookisms in any instance to make your writing better). I guess my question is simply: Is it correct to place more than one speaker's dialogue in a paragraph and, if so, what circumstance is this acceptable in?