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I think what you have in your example is fine. Quotes don't have to be strictly spoken dialog. You've indicated in narration twice that it's written on the sign. The reader will understand.
Answer
#4: Attribution notice removed
by
System
·
2019-12-13T12:00:34Z (almost 5 years ago)
Source: https://writers.stackexchange.com/a/21326 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
by
System
·
2019-12-08T05:07:31Z (almost 5 years ago)
Source: https://writers.stackexchange.com/a/21326 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I think what you have in your example is fine. Quotes don't have to be strictly spoken dialog. You've indicated in narration twice that it's written on the sign. The reader will understand.
#1: Imported from external source
by
System
·
2016-03-13T13:33:24Z (over 8 years ago)
Original score: 3