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Text from tarabittolo - English

Doubt about genitive form
We're doing a research work and we're currently analysing two different systems of speakers living in the 14th century's London.
We have a doubt regarding the genitive form.
Would it be more correct to say: "System 1's speakers" or "System 1 speakers" "System 1's pronunciation" or "System 1 pronunciation" We're not sure if it's a genitive form or an apposition. Thanks!

Title
- Doubt about genitive form
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Sentence 1
- We're doing a research work and we're currently analysing two different systems of speakers living in the 14th century's London.
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- ADD a NEW CORRECTION! - Sentence 1
Sentence 2
- We have a doubt regarding the genitive form.
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- ADD a NEW CORRECTION! - Sentence 2
Sentence 3
- Would it be more correct to say: "System 1's speakers" or "System 1 speakers" "System 1's pronunciation" or "System 1 pronunciation" We're not sure if it's a genitive form or an apposition. Thanks!
  Vote now!
- ADD a NEW CORRECTION! - Sentence 3