Gas K Constant

[Jasmine Reblando 3A]

If I were to write out the equilibrium constant of a reaction that includes gas, would it be incorrect if I forget to put P before the products and reactants?

[Sharlene Duong 3E]

I think to be safe you should put the P before the products and reactants because if you use [] that means the reactants and products are being measured by molar concentration rather that in atm or bar.