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Romeo and Juliet is in the public domain. And it's not even the source material - Shakespeare borrowed the story from somewhere else, (Pyramus and Thysbe is one very similar story, and Ovid didn't ...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/42291 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/42291 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
_Romeo and Juliet_ is in the public domain. And it's not even the source material - Shakespeare borrowed the story from somewhere else, (Pyramus and Thysbe is one very similar story, and Ovid didn't invent it either) and retold it in the form of the famous play. That means you're free to rework the source material. The same is true of common fairy tales, and for works that are in fact original, but already in the public domain. For example, Rudyard Kipling's _The Jungle Book_ recently got retold by Neil Gaiman as _The Graveyard Book_. No mentions of the original - it's for the reader to figure it out. (Technically, he mentioned it in the Acknowledgements section, but that's not a legal requirement). Retellings of older stories are common enough, and fall within the realm of **[intertextuality](https://en.wikipedia.org/wiki/Intertextuality)**. That's when there is a strong relationship between two texts, and the latter is better understood in light of the former. If you feel strongly that you should acknowledge the influence of another work on yours, you can always mention it in the Acknowledgement section in the end. But I do not recall James Joyce, for example, formally acknowledging that _Ulysses_ is strongly connected to the _Iliad_. He expected readers to be smart enough to figure that out by themselves (from the title, for one thing). Note that all this is **only true for works that are in the public domain**. If a work is not yet in the public domain, you can expect to beet accusations of plagiarism.