Advice Buying DDR3 Sticks for my Macbook Pro 13”

Hi Guys!

I’m tired of the lack of RAM that my Macbook suffers from.
I can’t have anymore than 10 different tabs open in chrome and it just starts lagging a lot!
It only has 4gb DDR3 (stock configuration).
From what I’ve seen at Apple, this model supports at least 16Gb.
Since I have no intention in upgrading anytime soon, I want to use then 2 slots totaling 8gb.
The reason why i’m asking in this forum is because I’m no Pro in computer hardware and i’m living in Portugal right now, so I need to buy it from any Portuguese store. (in case of any RMA issue). I’ll leave the link below.

So far, ’ve searched in this website (which appears to gather some stores) but I don’t really know what to choose since there are DDR3 and DDR3L SO-DIMM memories. (left the link below)
Please help me choose 2 4Gb memory sticks that work with my Macbook.
If you have any other stores please suggest, thank you.±Port%C3%A1teis-±&query=%5B%5B%22110%22%2C%22745%22%5D%5D

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See this link it will walk you right through everything you need to select the right ram on the crucial site.